check out radio one right now. The latest essential mix is from Tiesto @ Disneyland Paris, believe it or not.
Personally I'm not a fan of the guy. He's an egotistical prick that values nothing but himself. And his music is cheesy to me. But that's my opinion. I'm more of a tech-house and progressive house guy. DJ's like James Zabiela, John Digweed, Steve Lawler do it for me.
I can't deny that he's done a lot of good by opening up electronic dance music to new people.