The average Jedi Master can beat the average Sith Lord

Considering historically the quality of Sith Lords (particularly after Darth Bane introduced the rule of two), I have to disagree. Both Obi-Wan and Mace Windu are widely considered among the upper levels of the most powerful Jedi ever. Darth Revan is also widely considered to be in that area for Sith Lords too so I'll use that benchmark. I must say however, Darth Vader was two words: failed potential. His mechanical augmentations just destroyed his ability to fight, and while he did have the highest midi-chlorian count these augmentations were his downfall. To make a fairer comparison I'd compare Darth Nihilus or Exar Kun alongside Revan, in this case I'll take Exar Kun. Now to the point: To say that these two Jedi would be more powerful than the two Sith Lords all comes down to 3 traits I think: causes of downfall, fighting ability, and success in life. I'll start with causes of downfall: Obi-Wan and Mace Windu weren't technically overpowered, they surrendered themselves and were back stabbed by an idiotic kid in a poorly acted movie, respectively. Revan was absorbed into the force as a jedi, so he wasn't really beaten either. The only person in this comparison who died in battle was Exar Kun. The reason I bring this up is that Exar Kun, as I mentioned before, is of similar ranking in Sith history compared to Obi-Wan and Mace. His cause of downfall was at the hands of Luke Skywalker (and not movie Luke Skywalker with much to learn, grand master Luke Skywalker in all his glory) after he separated his soul from his body. Furthermore, Luke couldn't defeat him alone, several of his best pupils had to work together to banish Kun forever. If this caliber in Sith history can almost defeat arguably the greatest Jedi Master ever alongside his greatest pupils, imagine the power of the greater Sith. That condition points to the Sith being dominant power wise, let's look at another comparison: Fighting ability. In the case we have a bit of a dual parallel. Exar Kun, while later in life became an immensely powerful dark side sorcerer was a duelist for a good portion of his time. He used a flurry of ever changing techniques in saber to saber combat to keep his opponents off balance with his trademark saber staff. Made Windu was also strongly connected to the force but again is a very powerful duelist, he managed to very nearly kill Darth Sideous in battle had Anakin not interfered. Who was more powerful though? All things considered Exar Kun had another very powerful duelist fight him in Vodo-Siosk Baas. Baas was another historical renowned duelist and arguably had more skill than Windu himself. Kun defeated him easily as a Sith Lord. Kun could also more than likely defeat Windu as his skill with the art of his fighting style. In combat, Kun used nonspecific form and often changed it to counter whatever his opponent threw at him. I find it difficult to comprehend Mace Windu overcoming this, and so in battle I find it rather easy to see Kun defeating Windu. Another parallel is Revan and Obi-Wan. Both were more of a balanced attack between force and saber skills, leaning slightly towards the lightsaber in combat. Obi-Wan was an excellent swordsman but Revan was easily better. Obi-Wan had only Anakin and maybe Grevious to show for his saber ability and his force abilities were just not quite up to par with Revan. Revan had so much more, defeating the fully functional Mandalorian army that Obi-Wan was overpowered by several times when they were fragments of their former selves. He was far more adept in the nature of using the force demostrsting abilities far beyond that of Kenobi. Once again, the Sith triumph in power in this contest. Let's look at another aspect: success in life. Obi-Wan and Mace Windu were no failures, they were some of the clone wars' greatest generals. Obi-Wan trained Luke Skywalker himself. The Sith; however, still have the upper hand in my eyes. Exar Kun wanted one thing: power, the basis of this debate. He got it in boat loads. While an excellent duelist, he also was a legendary Sith sorcerer and I reiterate: he seperated Grand Master Luke Skywalker's very soul from his body. Kun succeeded entirely in his quest for power and held onto it longer than almost all other Jedi or Sith. Revan led a Sith revolution that would have evolved into an empire had he not been betrayed by Darth Malak and he too succeeded greatly in his goals as a Sith until that point, conquering multitudes of planets. For the third time, the Sith show their power to be higher. Looking at the overall structure of two pairs of equal and opposite Jedi and Sith, I find there to be no contest in the Sith having superior power. They simply have an edge over the Jedi that is hardly ever overcome by sheer force on the Jedi's part. A Sith's most common downfall is other Sith but what's a Jedi's most common downfall? Sith. Look at the facts people. The Sith are more powerful than the Jedi.