Kylo Ren is the weakest Sith of the 5 main (listed) Sith Lords

1) Bloodline Kylo Ren is the son of Leia and Solo. Since Leia is the son of Vader, but Solo has no 'force' in him (in the original trilogy he thought the Force was a bunch of bull), then Kylo Ren actually has a WATERED DOWN bloodline in terms of the force, since only half of his parents have any 'Force' to them to begin with. This makes him directly INFERIOR to Vader in terms of bloodline, since Vader was the original chosen one meant to bring balance to the force, and since Kylo is two generations away from Vader, and only 1 of his parents have any 'force' with them at all, Kylo definitely does not have a bloodline advantage over the other Sith Lords, ESPECIALLY Vader. In the movie itself, Kylo admits that he still feels the 'Light' in him, indicating that in the amount of Force he DOES have, some of it actually pushes Kylo towards the right side, not the dark side. Kylo's bloodline therefore does not prove any definitive advantage he would have over other Sith Lords in terms of ability to use or feel the Force. 2) Dark Side Affiliation"Kylo Ren is anything but stable. He is fiery, angry, sick, and resentful, always acting out of spite and rage"That is an argument AGAINST him not an argument FOR him. The fact that he is always acting out of spite and rage and is sick by your own admission means that other Sith Lords skilled in playing mind games with people (Vader, Sidious, Dooku), gives those people an advantage over Kylo in a duel. 3) Rank"Kylo Ren is also master to the Knights of the Ren, a paramilitary group of assassins and dark side worshippers who take on explicit kill/capture missions from Kylo Ren himself."Sidious was an EMPEROR who had EVERYTHING under his command, including multiple death stars and all other Sith Lords listed in round 1. If we break down strength by where people rank, Sidious has Kylo Ren outclassed by miles. "Kylo Ren's unique leadership position in both these organizations"Kylo isn't a leader at all. He answers directly to Snoke, Snoke being the one who also commands Starkiller base, not Kylo. Even General Hux answers directly to Snoke when not answering directly to Kylo, meaning Kylo is just an ordinary low ranking general if nothing else. 4) Willpower"Kylo Ren has the strongest will and is least likely to cave to mental pressures"You literally mentioned earlier in your arguments that Kylo Ren is anything but stable.... Like you actually said word for word that 'Kylo Ren is anything but stable'..... He therefore IS very likely to cave to mental pressures, which Sith Lords like Dooku, Sidious, and Vader would be very good at utilizing against Kylo in a fight. Your previous remarks completely undermine your claim that Kylo Ren is the least likely to cave to mental pressures, and since Kylo is 'fiery, angry, sick, and resentful, always acting out of spite and rage', he clearly would be vulnerable to mind games from just about all of the Sith Lords mentioned before5) Physical Conditioning"The Emperor and Dooku themselves are old and past their primes. Sidious' body itself is ruined and scared by exposure to his own force lightning"Sidious despite being hit by his own lightning, managed to fight off Yoda in Episode 3, and almost killed Luke himself in Episode 6. Dooku meanwhile was also the one who despite his age managed to cut off Vader's arm when Vader himself was in his prime, so even though Dooku and Sidious are old, they are still certainly capable of taking on Kylo in a fight. "Maul, while notably agile, has subjugated his body over the years to insane amounts of torture training and tattoo body piercings that deliberately keeps his body in a constant state pain"There's no evidence in Ep 1 that Maul was always in a constant state of pain. Even if it were true, the fact that he could take on two well-trained Jedi at the same time while in constant pain, killing one and almost killing the other, would imply that Maul could still take on Kylo in a fight, irregardless of being in constant pain or not. 6) Best Lightsaber WeaponI recall Dooku and Sidious being able to shoot lightning from their hands, Vader being able to force-choke people, and Maul having a double sided lightsaber. Having a Crossguard on a lightsaber is a defensive measure at best that only pays off when in the hands of a very skilled user. Kylo had his shoulder and face cut several times by Rey in the lightsaber battle between the two of them, where the crossguards on Kylo's lightsaber proved to be very unhelpful overall. "the advantage of a single hilt over a dual blade two-hander will always be that the non saber hand is free to use force powers"Which is where Vader and Sidious and Dooku come into play since all of them have substantial non-force powers of their own... 7) Most Successful Star Wars Villain"He stopped Luke Skywalker's plans to return the Jedi to the galaxy by killing his padawans"Killing kids isn't that hard to do. Killing fully trained Jedi on the other hand IS, and in that department, Kylo can barely beat complete novices like Finn or Rey in battles. All the other villains have bested or at least thwarted even the most highly trained Jedi in battle, often while outnumbered... Kylo though has no victory of similar significance to his name."he helped revive the Galactic Empire in the form of the First Order"It cant be proven that he revived the Galactic Empire via the First Order, its just as plausible that the First Order materialized on its own and that Kylo was simply indoctrinated into it by Snoke, his master, and the ruler of the First Order. To summarize, Kylo is clearly weaker than the four other Sith Lords mentioned. He can be easily manipulated as Ep 7 strongly implies, he shows difficulty fighting people completely new to Lightsaber battles such as Finn or Rey, and by con's own admission Kylo is mentally unstable who acts out of emotional rage....