I wish I'd seen it in 2D. I'll watch it again on the small screen.
I would have preferred they explore the city as well. Trapped in a single building seemed like something better suited for a TV episode, not a feature length film.
My other parting thought is that the movie seemed to be more about the rookie than the titular character. Dredd himself was just along for the ride in someone else's adventure.
Walla Walla Bing Bang.