I don't think I've ever had a decent video call, just ends up costing an extra few £ at the end of the month for nothing.
MMS.... I have been known to use them, so it's a bit of a shame the iPhone doesn't have it (haven't got one, but plan on doing so when my current contract runs out soon).
Camera..... Oh dear, why people think a 5mp camera on a phone is a good thing I'll never know. The lens is still plastic that's having contact with all sorts of things during the average day so what's the point in anything over 1.3mp?
All in all I've been very impressed every time I use an iPhone (not something I expected when I first heard and read about them). On the other hand, I've borrowed a collegue's N95 for a few days away before and really didn't like it. But then I've never liked Nokias for interfaces.