I think he is pretty good. He's certainly been in a lot of movies I really like - JFK, Untouchables, Tin Cup, Field of Dreams, etc. I'd add No Way Out to the list as well.
But who knows, those movies may have been just as good without him. That's always a real possibility, and for me I call it the "Pretty Woman" effect. (Warning: rant against Julia Roberts coming). I HATE Julia Roberts. That movie was a perfect storm. I think you literally could have put any actress in that role, and it would have been the springboard to a great career. Yet because the movie was such a success, she was able to get herself into other big movies. Does anyone find her attractive? I certainly have never thought she was. The true way to tell you are a horrible actor/actress? She was in "The Pelican Brief" with Denzel. I think this was one of Grisham's best books. And she was opposite freaking DENZEL WASHINGTON...and she managed to ruin the movie. Absolutely ruin in. Her breathy whispers made me want the story to change, and have the assassin actually connect with a bullet in her brain. /endrant