On my phone, it sounds to me a little warbly or choppy. Not enough to be unusable, but enough for me to find it jarring in comparison to other smartphones I have. (I do mobile development; I have Far Too Many smartphones on my desk.)
However, my friends who tried out my phone didn't notice anything wrong, so perhaps I'm just being oversensitive.
Do you drop a lot of calls? I have people on the other side who can't hear me and then I also drop a ton of calls in areas that I normally blow right through with no problem at all.
i have that problem with my droid eris. i went to my verizon store and told them but of course they couldnt hear it so couldnt help me. im going to try some of the suggestions on here.