[quote=Dervish]
I strongly considered Saren, but then I realized he only makesa handful of appearances in the game and you fight him twice. I honestly thought the Illusive Man was a far more captivating antagonist.
[/quote]
A good villain is not one who makes allot of appearances, kills tons of people, or has a fleshed out story. Those help, but a villain needs to make sense to me, they just need to fit the story the same way the protagonist does. Saren is the ultimate anti-Shepard, he is a person, Illusive is a symbol for Cerberus .

I also just have a thing for fallen-paladins.