Ewan was incredible. The true test is whether you can picture anyone else playing the part. I honsestly can't imagine it. He IS Obi.
Palps was actually annoying to me in several scenes.
Anakin didn't totally suck, but he's still a tool.
Mace was pretty good throughout.
Padme was horrible. Was it just me, or is she a lot fatter, and way more whinny and annoying.
But YODA is the man. He gets my vote. I actually did choke up during that scene.