I have pretty good 3g reception in the house. I seem to have 1 bar pretty often in general, though. The good thing is that the speed with 1 bar is still awesome. Still absolutely kills edge and no problem talking or anything. I'm not sure what the story is, but with 3g I really don't notice much difference between 1 bar and full. It's also very sensitive to my hand placement it seems. If I leave the back of the phone uncovered by my hand in my bed, full 3g bars. If I hold it with my hand around the back, I lose 2 bars, lol. Every time.
The worst part for me is just AT&T coverage in general. It's terrible compared to Verizon for the areas I frequent. I live in the DC metro area where coverage is great (3g pretty much everywhere), but I work in southern Maryland, where the coverage is awful. I have "no service" for like 40% of the ride, 1-2 bar edge (useless for internet) for like 25%, 3-5 bar edge for like 15%, and the rest 3g. Pretty annoying because in the car pool is when I want to use the phone the most (when not driving) and I really can't do much with it since the reception sucks. Hopefully they improve it, but it's been bad for a while (for friends with AT&T) so I doubt it's high priority.