I've downloaded Scrabble and NFS, no problems at all. They downloaded and installed faster than I expected, and haven't crashed yet, played them each a couple of times. I'm very impressed w/performance of NFS, though to be fair, I have not seen how it performs on the iPhone.
Edit: Okay, I did get the "too many cards" error a couple of times. But just exited the app w/out restarting phone and that fixed the issue for now.