When I first got Uverse, I really noticed the picture problems with fast action. You're right, basketball was pretty bad - Jason Kidd is pretty quick, but I don't think he breaks down at the molecular level when he drives the lane.

It has improved quite a bit since then. I don't have HD, but noticed the other day I had the 2/2 profile with the higher bandwidth cap. Maybe that helped? I was originally on the 3/1 profile.
I also noticed a post in the employee forum that said if you have a electonic component too close to the RG, it would cause picture problems. The TV in my daughters room is only about a foot away from the RG (but separated by a hollow wall). I'm going to try moving the RG a few feet away, but I can't seem to remember to bring my patch cables home.
Is it the tv or the uverse. unless the display has 8milisecond response or better, you will see sucky blur on fast motion. Also the mp4 comression can also add to this problem. However if you have "slow" glass on your big screen, it will suck big time on fast motion.. and yes,, the basketball games are the ones that show it the most.. other programing keeps the subjects centered in the picture so there is not the fast motion.