Watched it recently, really enjoyed it.
As for the storyline comments, there is a good interview with the film writer and it talks about the story line decisions.
Long story short being that they didn't feel that they could do a scorched earth story line ( or similar long term storyline from the comics ) justice in time of a single film, and instead chose a more single-comic story line of the single building plot.
As for the city, I felt that the mega blocks were too evenly spaced across the city when they showed the wide shots, made it feel false. Reality is that you'd get em clumped together in pockets like high rise flats are.
Must watch again soon.