I gotta say the whole cast was absolutely brilliant. They really worked well as a team.
Nolan hired the right actors for the right position. Well done!
I would have liked to see Michael Caine's character to appear a bit more in the film but its ok. I'd have to say besides Dom, Arthur was my favorite character.
Its hard for me to pick just one. Cobb and Mal brought great emotionality to the film and were both awesome. Eames was just BA. Fischer was actually a really good character as well. I loved Saito as well, even if his character was a little surface level. I don't know who to pick.
I can't choose just one. Cobb was riveting. Mal was gorgeous and frightening, and kept me on edge every time she appeared. Arthur was a badass GQ MF. But Robert Fischer was heartbreaking.