No problems so far
I saw all the complaints and thought I would tell about my experience. I subscribed to U-Verse Internet two years ago and have had no problems with it. Now, I don't subscribe to their TV service (or any other, for that matter), so I cannot really talk about it. But I'm happy with the Internet service (I have Elite - 6/1 Mbps). The modem that AT&T provided is ugly as hell, but it works - both Ethernet and Wi-Fi (I stream to my Roku box across the house). Speed tests always show consistent speeds at around 5.6/0.9 Mbps. I cannot really comment on the customer service, since I had never used it - it just works (and my IP address is still the same as two years ago, which is convenient for remote desktop connection).
Hope this helps.