I'll go first. You're holding it wrong.
I've dropped a few calls before, yes it's annoying but it's not the end of the world.
While I'm sure the antenna issue exists, for the limited calls I make (mostly a texter), the proximity sensor has been more of an issue than the antenna.
Hey! It's fine! It only drops 1/100 more calls than the previous 3G models!!!
The only calls I have dropped were because of bad AT&T reception in places, not because of my iPhone 4.
Side note: I bought my iPhone 4 on launch day
Does 4.2 fix the sensor?