I wouldn't really go so far as to call the last seasons of Atlantis "quality tv". There were some moments, but I think there might still be one or two eps of season 5 that I couldn't bring myself to watch and some of what I did watch was was pretty bad.
Howeven, no matter how bad it got (and I think it might have been better if it hadn't already been pretty much written off) it was ALWAYS ALWAYS better than SG-U turned out to be.
So, I'd totally vote SGA back! (If there was ever such a vote.)