Have you tried holding it differently? ;)
Seriously though, of the dozen iPhone owners I know (two are brand-new-to-Apple iPhone 4 buyers) 4 have problems (including both the iPhone 4 buyers). I think you’re right; iOS 4 just isn’t ready for prime time, as it seems to depend upon the mix of apps, memory usage, and phase of the moon to determine what works and what doesn’t. In some aspects the phone is improved, but in others it’s seriously degraded (or stopped altogether).
I and some friends are on iOS 4 on 3G's with no problems...and the camera does seem to be better...plus with zoom...
I am a first time iPhone buyer although I am a 20 year Apple user with about a dozen of their products.
I have two friends who also bought the iPhone 4. All are previous Mac users. I have 4 co-workers who bought the iPhone 4, none of which uses a Mac as a computer. For one of them it was his first Apple product.
I do not doubt the problems but none of the people who bought the phone that I know has problems.
The phone can be returned.