I think X-Men 2 was a good one to bring up, I was very impressed with it.
However I am a T3 fan, I thought that they finally came up with the perfect action flick. Now dont get me wrong I am a film student and appreciate good film, or at least try to.
But anyone with balls can appreciate what T3 was. It was fast paced, any plot that didnt involve action was quick, to the point and shallow, all good things for action.
The action was amazing, never have I seen so many things blow up and rarely did I notice the mix between cgi and real life as a bad thing. The fight scenes were fast powerful and most importantly entertaining, not boring like the Matrix.
It was fast, it was loud, shit blew up. What more do you want?
Oh and one last reason, Arny is what? 55? Older? But still looks like one bad ass Terminator.