I like Hayden Christenson in Episode 3. It must be the new hairstyle and suit but he just seems so much more appealing than he was in 2. I think Darth Maul is alright but it don't really save Episode 1 for me. I think Episode 1 is a snorefest. In episode 2 I like that they made that extended universe character Canon, that bounty hunter, whoever she was called.

Edit: If you wanna talk about bad acting in Star Wars you should talk about Luke in the OT. I think all his acting seems unatural. Not as bad as Hayden but not as good as the other guys in the OT either.