I've had the opportunity to be around Christie a handful of time. I think it's easy to understand why people like him, he has attitude and people respond to it.
He's an incredible politician. He can whip an audience up into a frenzy with his passion, or he can silence a room to a point you can see people hanging on every word he speaks. He is personally talented and gifted. It's his politics that will limit his growth however. He's doing a great job of getting himself re-elected in a very difficult state for a Republican, but in doing so he's basically killing any chance of national political run.
I like him, but I'd probably never vote for him.
As presidential politics is concerned, he's the 2nd coming of Rudy Giuliani, but I think he will flame out before he actually runs for president.