Atleast once a week, but upto 8 times a month if theres a fair few decent films out.
This year I've seen Avatar, Alice, Book of Eli, Cemetary Junction, Up in the Air, How to Train Your Dragon, Clash of the Titans, The Ghost Writer, Shutter Island, Kick Ass, Ponyo and probably others I've forgotten to mention...so yeah does work out to about 1 a week. Probably get busier as all the summer films come out.
I think most of people complaints about the cinema are their own fault.
Too expensive? Buying popcorn is a waste of money but your own choice. And of course many cinemas are cheap on Tuesdays and have Orange Wednesday. Be smart.
And as for the crowRAB being bad, they can be, but avoid going at peak hours and you should be fine in most cases.