I thought the ending, while very entertaining, was the worst part of the movie.
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He just killed everyone, quite easily, as if he could have done it at any point in time. Twenty or thirty guards wasn't a challenge? Shit, man, then why didn't you bother saving whatsherface from being fried? At least in the Matrix ending when Keanu goes nuts and beats the badguys, there was an epiphanic moment. In Equilibrium, he just got up and suddenly decided he'd been half-assing it when he was just killing two or three guys at a time earlier.
Honestly, I'm not really trying to bash the movie. I was able to look past most of that, and enjoy it for what it was. Good, fun, action movie, with plenty of the old ultra-violence.