People here love to bash AA--often rightly so--but from my experience I've had crews ranging from good to great on most of my flights. American Eagle seems to be consistently better than UA Express or DL Connection (at least in Y/Y+). As for mainline I've had great experiences in Y/Y+ on most of my flights with the only exception being when I flew AA334 JFK-ATH last August in Y+ and the crew gave away my special meal and never apologized, but instead harshly made me choose one of the standard meals (the only reason I know the FA gave it away is because I overheard another, much kinder FA telling the harsh one that they just gave away my meal. They never even acknowledged it to me...)