AT&T stadium is nice, and there is not really any "bad" seats. People bag on it saying it is not like a "stadium", and what they mean is it is nice, and when walking around it is not like walking inside a giant concrete and steel girder erector set like a "real" stadium.
It is like being in a mall. TV's everywhere to watch the game, restrooms are clean and have lots of stalls, and there is interesting art work and architecture.
I have sat in a section that was as high as 414 before and the view is very good, but the players will seem small (as with any high stadium seats), but site lines are good. One thing about the experience is that unless you are on the lower bowl levels the TV is soooo big and the picture is soooo good that you will find yourself watching the TV and not the field as it is a bigger and better view.
That is one thing that is both good and bad about the experience. You can see everything clearly, but the best view and what draws your eye is the giant Video screen.