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Jamie Foxx. Even though he's had his good moments, I just don't think he's that great. Solid actor, but not outstanding.
Nicholas Cage. He was a good actor, but now he grew too confident in his abilities and figures he can do anything. Makes for good hammy fun at times though.
Mel Gibson. He's decent at best. I just never find him that interesting in any of his films.
Now, for ones I think people bash too much:
Mark Wahlberg. He's not amazing, but I think he's a very solid actor, when given the right role.
Leo DiCaprio. Sorry for this, Rodent, but I just don't find him to be an over-hyped pretty-boy with no talent. After seeing him in several films (The Departed, Blood Diamond, What's Eating Gilbert Grape?, Inception, Titanic, Catch Me If You Can), I can honestly say he's a fine actor with enough chops to be an awesome leading man in the right role. His face might be aging slower than most, but I still think he's a great actor.