Good Evening, Rocket_Girl,
I must be honest, I'm at all not impressed by AT&T performance in my area either (Tampa, FL). I have HTC Titan, and I rarely seem to be getting speeds over 1mbps. Almost every time I test, an average speed is about 0.8mbps for downloads and 0.4mbps uploads.
It's incredibly disappointing seeing how horrible this network does comparing to Verizon network that costs about the same per month (my friends try to rub that in my face every chance they get). I pretty much gave up on streaming any HQ videos on YouTube, as it takes forever to buffer with YouTube Pro.
As far as voice goes, so far I haven't had many dropped calls, but I rarely seem to get 5 bars either. It's usually between 2-3 bars.
I'm hoping that big improvements are coming to AT&T data network within the next year, otherwise I will probably be moving on to another provider.