I'm a fan, but realize he's very one note. He probably plays charming better than any other actor on the planet.
But when it comes to angry, tortured, whatever, not at all.
So I'd expect to like him a lot more in The Descendents than in Ides of March. But I haven't yet seen either, just going off his past work (though it was a bit of a challenge to remember Syriana even existed...).