The Star Trek mirror universe federation is at least as bad as Star Wars' Empire

"In order to destroy the surface, the Constitution vessels have to fire multiple times under sustained bombardment which makes them vulnerable whereas the Death Star is a one shot one kill. Also, the Death Star not simply irradiates and obliterates the surface of planets but completely pulverizes the entire planet. This introduces the effect of fear that the Constitution phasers and photons simply cannot match and fear is a very powerful weapon."However the constitution class's shields are more than enough for what most planets can fire at them; so it is not quite as vulnerable as you make it out to be. True; the death star is a one shot kill; but it also takes way more resources and power to use. In other words there is a limited number that can be constructed even with a galaxy of resources. Then there is also the fact that it is overkill. Sure they can destroy a planet; but destroying the surface of a planet is just as effective. Either way the civilization living there will never be able to return so the constitution class could be said to inspire a fairly equal fear level. Also the death star is much easier to destroy; you simply have to launch a torpedo down it's exhaust port. The constitution class has no flaws such that being able to get past the shields would allow it to be destroyed with one hit from a torpedo. "Further, the Death Star also had the ability to rapidly destroy several ships with its super laser as was seen in the Return of the Jedi. Also, the Death Star is the size of a small moon and would thus require countless blasts to its external shell completely pulverise it and render it useless."However those ships have to be within a relatively narrow beam width; an area that shouldn't be to difficult to avoid. Also it takes one torpedo down the exhaust port to destroy the death star, so you don't really have to get through the surface to render it useless. That exhaust port actually makes it much more vulnerable than the constitution class. "Also, one should not forget the fact that the empire has the capacity to build far more ships and man them quickly than the Terran Empire does due to Palpatine's access to an entire galaxy of resources and a steady flow of clone soldiers neither of which the Terran Empire has. This means that the Death Star could be protected by hundreds of star destroyers and thousands of TIE fighters at a time and do considerable damage before any vessels got close enough to launch a torpedo down the exhaust port."One should also remember that Empire ships are much easier to destroy; star destroyer shield domes are vulnerable and the death star has that exhaust port. True the death star could do considerable damage before it is destroyed but it's likely the first planet it comes to could destroy it; albeit after the planet is destroyed. However in the case it gets destroyed by fighters from the first planet it comes too, it would be more of a one time weapon."Really the only reason that the first Death Star was blown up is that Tarkin failed to think of blowing up the gas giant first and then the rebel base."Actually it was destroyed because of a design flaw exploited by the Rebellion."The Empire is further boosted over the Terran Empire when the stability of its command structure and culture as compared with the instability of the Terran Empire is taken into account."While it is true that the Empire has a more stable command structure, the Terran Empire has still been shown to be quite successful in enslaving worlds as evidenced by their history."Also, the resources of the Empire make the occupation of other worlds a cinch whereas the Terran Empire has a limited supply of soldiers and can become thinly spread very easily. This was seen in the Star Trek: Enterprise season four two parter "In a Mirror Darkly," where the Terran Empire had to resort to having aliens of multiple oppressed worlds in order to man their vessels, aliens whose species were also fighting in the rebellion."Since we are talking about the 23rd century Terran Empire, the composition of the crews in the 22nd century is irrelevant. In the Original Series episode Mirror, Mirror; it is actually shown that the crews of ships seem to have voluntarily chosen to become crew members to support the Terran Empire."Indeed these episodes bring another issue with the Terran Empire to light, their inability to innovate technologically. Here it was shown that the Constitution class of the Terran Empire was not of their making but was instead stolen from Tholians who had stolen it from the original Star Trek universe. Then, nearly a century later, they are using the same class of vessel for their flagship the ISS Enterprise as was shown in the TOS episode "Mirror Mirror."While it is true that they seem to have an inability to innovate they also try to steal any technology more advanced then their own. With their shields and formidable firepower they should be quite successful in many circumstances at stealing ships and technology, and integrating it into their fleet making them still quite formidable. If they don't have the technology they need, they'd just find someone elswe with that technology and steal it.CONCLUSIONFor my conclusion I will rate the Terran Empire and the Galactic Empire on a scale of 1 to 10 with 10 being the best in fear, cruelty, destructiveness, and threat level.FEAR FACTORGALACTIC EMPIRE: The galactic empire has the ability to annihilate both planets and civilizations; for these reasons the Galactic Empire gets a 9.TERRAN EMPIRE: The Terran Empire has the ability to annihilate the surface of a planet making it uninhabitable and therefore has the ability to destroy entire civilizations; for these reasons the Terran Empire gets an 8.CRUELTY AND AMORALITYGALACTIC EMPIRE: The galactic Empire treats soldiers as expendable pawns, and destroys anyone or anything against them; for these reasons the galactic empire get a 7.TERRAN EMPIRE: Officers in the Terran Empire rise in rank by killing superiors, for a minor offense they are subjected to a about 20 seconds of incredible pain and for larger offenses they are set in an agony booth which tortures them for extended periods of time; finally they enslave races and if they are opposed; destroy them. For these reasons the Terran Empire gets a 10.DESTRUCTIVENESSGALACTIC EMPIRE: The Galactic Empire has the ability to melt the surface of a planet or destroy a planet, but are incapable of destroying anything larger. For this reason the Galactic Empire gets a 9.TERRAN EMPIRE: The Terran Empire has the ability to COMPLETELY destroy the surface of a planet. For this reason the Terran Empire gets an 8THREAT LEVELGALACTIC EMPIRE: The Galactic Empire has star destroyers as their main weapons. Star destroyers can be destroyed very easily by crashing into the shield domes and are therefore quite vulnerable for a ship its size. The Empires ultimate weapon the Death Star is capable of destroying planets yet has a design flaw that allows a one man ship to destroy the moon sized weapon and is therefore somewhat vulnerable. The Empire also has small tie fighters capable of destroying small x-wing sized ships. For these reason the Galactic empire gets an 8.TERRAN EMPIRE: The Terran Empire has small ships that can COMPLETELY destroy the surface of a planet. Those ships by virtue of their small size and incredibly strong shields are very difficult to destroy and are therefore not very vulnerable. Whenever the Terran Empire comes across technology greater than their own, they will do almost anything to steal it and are normally quite successful. Although they have an unstable command structure because of the way officers gain rank; they are very successful in enslaving and destroying entire races due to their loyalty towards the Empire. For these reasons the Terran Empire get an 8.OVERALL RATING (out of 40)GALACTIC EMPIRE: 33TERRAN EMPIRE: 34The rating says it all; the Terran Empire is at least as bad/evil/cruel as the Galactic Empire.