Hasn't had one memorable promo in the WWE.
Dude ethered the fukk out of Foley in their encounters though. Thats pre-shield too. When he gets on his own and they give him the Bray Wyatt deal with writing his own promos well have a quotables thread up for him.
As for the topic, he can absolutely be better than Punk. Punk is often times too lanky for his offense so it comes away looking sloppy. In the indys you combat that by being stiff. In the E youre screwed.
Promowise, Punk does beat Ambrose but by a small margin. Punk has had about 7 years of big time experience with promos, Ambrose has time to develop but that window is closing with every legend that dies.
Ambrose has the scumminess of Edge, the slick heel ability of a Ted DiBiase, and the evil nature of a 2009 Randy Orton all into one. As long as they dont turn him face and give him a stupid catch phrase hes going to be the ultimate breakout guy of the shield in the long run