There are more reasons that people hate him
Attitude toward Blaine/badmouthing Blaine
Dancing around in a thong on Houdini's grave
First, he doesn't use camera tricks. Just because you can't figure out how he does his stunts, that doesn't mean that he uses camera tricks. And if you want to talk about camera tricks, what about David Blaine's camera tricks? You know the one where he levitated like a foot of the ground? That was nothing more then camera tricks (in the form of editing). No disrespect to David Blaine though, he's still a good magician.
Criss doesn't use paid actors. There would be no reason. That just once again goes to the fact that you obviously don't understand how Criss does his effects. If you did, you would see that there is no reason for paid actors.
Exposing magic is nothing new in magic. Many famous magicians have done so on tv. Houdini, Blackstone, James Randi, Banachek, Penn and Teller, and coutless other magicians have done the same thing. Houdini made a living off of exposing magic. Many magicians expose simple magic in their performances as a set up to a larger effect. And some do it just to get the audience more involved.
Who cares if he's a little "cocky." Yes, he gets very excited after he succeeds with a stunt, but who doesn't. That doesn't mean he's cocky. I have talked to people who have met Criss, and everything I have ever heard is that he's a very nice guy.
I have never heard Criss badmouth David either. I remember Criss saying something about how he was glad that David supported him in the Oasis stunt. Yes, there is a running competition between the two. But just the fact that Criss feels that David is competition shows that Criss respects David as a magician.
I also have never heard of Criss dancing on Houdini's grave. Criss has a lot of respect for Houdini, which is easily seen if you watch his show.
Love him or hate him, Criss is a great magician who has done a lot for the magic community.