I've flown with AA about 5 or 6 times over the years. The first flight was on a 767 ord-FRA. The A/C was too cold and never got any better the whole trip. Other trips since then have been average. I have found AA personnel to be nice for the most part.
It's hard to get a good feeling for an airline when you only fly them once in a while. I can't really judge AA fairly after so few flights. I think it takes 20 or so flights to get a feel for what the airline's style and service levels are.
One major reason I don't fly AA often is because I don't particularly care for their hub airports.