From a controllers perspective, I do not care to control on the network much anymore due to the lack of professionalism by the part of some pilots. A good majority of the pilots online do a decent job but it tends to be the few that ruin all the fun for everyone else.
Pilot training should be mandatory and it should be done in-house. With the advent of FSX on steam, we saw an influx of pilots onto the network that treated like it was a GameSpy server.
From a members perspective, the owners clinging onto the network like it's some golden egg is really poor form. VATSIM should have bec