I don't think Costner is a bad actor, but he was usually outshined by the other actors in his movies. I haven't seen enough of Sam Worthington's movies, but can anybody tell me if that's the case with him.
This reminds me of something funny though. Last year there was a video with actors talking about their favorite performances from the past decade.
Guess who Sam Worthington picked?
Eddie Murphy in The Nutty Professor. I'm assuming he was talking about the first one, which wasn't even a film from the 2000's. That made me laugh.