I haven't seen a whole lot of Ambrose but he looks like a natural. Instead of just cutting a normal promo, he'll put a bit of his own flair into what he's saying and make it interesting. The "nope" .gif is such a minor, insignificant thing but I like that. It's different. I remember a few months ago, Punk was cutting a promo but instead of doing the usual thing, he went over to the announcers table and sat directly in front of Lawler.
For me, one of the problems with the WWE right now is that it all looks too perfect. Everyone does exactly the same thing all the time. If that was another WWE wrestler, they wouldn't have added that expression which Ambrose added, and they would have delivered the Punk promo from the centre of the ring. These are really minor things yet I think they add a bit of flair and reality to a character, rather than the usual boring shtick we see from everyone else.
On another note, Roman Reigns has one of the best looks I've ever seen from a wrestler. He looks like a future WrestleMania main eventer.