Apple's been fairly lax lately with its checking. A friend's game that we were able to get crashing on launch 100% of the time passed through the original submit process without a peep.

The same friend, just for kicks, submitted a deliberately broken app that didn't crash but showed a blank screen after launch. It also got approved without incident. It's like Apple just ran automated tests, but no human ever saw it.

I have a feeling that Apple's process varies depending on the kind of app (free vs. paid), the platforms you're targeting and your past history.