Alright, since everyone is arguing over the details and facts, let me lay them down straight. And don't anyone argue with me because I actually studied this crap.
Creativity: Almost zilch
All of his effects are previous effects by other people. In fact, the one trick he claims is his, was actually designed by Paul Harris, the guy who gets all of Blaine's tricks. David Blaine just named it
Skill: Even though I do not like his style, I have to admit he has skill. Even though he has to film many times, until he doesn't screw up. Also, his stunts aren't really that original. Most humans can actually do some of those stunts, and end up in better condition than Blaine did. Plus, he had to use camera editing, and cut out some scenes to make his tricks seem cooler. How low is that?
Final Analysis: Not actually much better than some of the guys on this freaking forum, just less shy and luckier.
I seriously do not understand why this guy is even up here, but whatever
Creativity: He hasn't created any "Completely new tricks", but he has taken a few good tricks, and made them better
Skill: He memories hundreds of tricks, and previews them for you. I doubt he screws up a lot, but who knows
Final Analysis: He's just like one of us, but he works at Penguin Magic
Creativity: He has a few cool creative tricks
Skill: He has some really good ideas, that are close to perfect, but never reach it. He is a very good showman however
Good, but would probably be better off, being an adviser to some big shot magician.
Creativity: He takes old tricks and slights and shuffles them around, until he gets something that looks different. Not bad, just bland
Skill: Someone here said that he can even fool laypeople. That is completely wrong. I've seen him preform before, and they were completely fooled. I've even seen him mess up badly, and pull himself back together. I think he has extremely good showmanship, because he takes simple tricks, to have an extreme result
Final Analysis: Probably never will be the "greatest" magician, but maybe up to a Lance Burton kind of level. And those who disagree with me, check out Lance Burton's old style, and Sankey's style.
I'm not even gonna do this guy. He will never be a "great" magician. He is a little creative, and had some good concepts in Liquid Metal and Spun, but I doubt he will get too far. Where is he now anyways?
Style:Close-up(those of you who disagree watch Illusion)/Stage
Creativity: A lot of people have claimed David Copperfield is great at creating tricks. He has created a few tricks, but many were invented by people such as Paul Harris, Jay Sankey, Gary Oulette, etc. His two most famous tricks, Statue of Liberty and Levitation, were created by Jim Steinmeyer and John Gaughan respectively. However, some of his other tricks, he did create, and I give him a lot of credit for that.
Skill: Extremely good showmanship, and acting. He has a small problem though of the order of the tricks, so some really good tricks, seem kinda small and stupid.
Final Analysis: If there is a "greatest" magician in this bunch, this guy is probably it. Even so, there a bunch of other great magicians out there.