The software fix that Apple is referring to was already released to show the true signal strength in a customer area. From what I've experienced travelling in the USA is that while AT&T has great coverage they do have an issue with their 3G network which definitely needs improvement. Most times I get either below or just above 1 Mbps download speed on AT&T USA HSPA (3G) 7.2 Mbps network with between 1 to 3 bars signal strength. Compare that to my speed in Canada on Rogers HSPA+ (3.5G) 21 Mbps network.
Oh. Poor quality. Before I bought iphone 4, I thought maybe the signal issue was not that serious. While,when I'm really using it, I can now feel how frustrating it is with a always-one-bar signal. And phone calls are often cut off because of bad signal. Besides, to my surprise,holding the upper left corner can really decrease the signal. What a tragedy.
Maybe Apple should do more to compensate for our losses.