Personally, I think online reviewers are far too picky when they review lower end electronics, and get carried away with trashing them. Maybe I would too if I were spoiled, but who knows.
Either way, I haven't had a complaint about call quality other than your usual cellular issues, which happen no matter who your carrier is. I've also got a nice digital camera if I want to take high quality photos, so that's an invalid argument to me as well.
The only complaint I really have so far is the fact that you just can't seem to get enough volume from headphones. It sucks when the road noise from your car makes it hard to hear the music clearly. Amplified headphones is the resolution for this, from what I've read, although it would be nice to not have to spend extra money on headphones and possibly a 2.5-3.5mm adapter.