Other then a rough rollout the first couple of weeks free WI-FI has been pretty reliable and I have had it on almost all of my flights since March, including many ERJ175 and CR7 and CR9 flights. It is amazing how quickly it has become the norm.
I think American handles IRROPs really well. I had a flight delay YYZ-CLT- AVL a few weeks ago and after a quick phone call they were able to reroute me on a delayed YYZ-ORD flight then on to AVL, still keep me in first, and I actually got in about an hour earlier than scheduled.
People complain about the Admirals clubs but I find them to be well worth the annual (CC) fee, especially the clubs in DCA and LGA.