On AA, they try to seat all the "Premium" passengers in the best seats, and the F/As try to give a little more service. The only time I have noticed a difference on AA is on a three class airplane booked for two classes. From ORD-SFO, I got to fly in Business Class seats, with the full fare coach. Still coach service, however.
I have to agree about AA food not really cutting it. 6.5/10 would be a solid D...