We have found AA to be fine.. but maybe that says more about British Airways
We thought Delta was better than AA... so if you think Delta are poor, watch out!
AA used to have a great seat pitch in coach class... they took out a few rows of seats when there were less passengers after 9/11, but all those rows are back in the plane now.
To be honest, all airlines have good days and snafus. It's often just your personal experience that differs them. Of course, first class air travel is way better, but I would rather travel coach and take more cruises.
You're only on the airplane a few hours.... hopefully