ATG sizes it all up.
I could count the number of times I've walked out of a movie on one hand. Not only do I avidly avoid suspected cinematic stinkers, but I generally hate leaving anything unfinished. Usually, if I find myself parked in front of a particularly bad waste of celluloid (Shrek 3, The Taking of Pelham 123), I'll just doze off and catch up on some shut-eye while I wait for the third act resolution. Halfway through District 9, though, as my brother and I gathered our half-eaten, over-priced snack foods, arose from our seats and prepared to exit the theater, I have to admit that I felt pretty good about it.