I miss when the game wasn't completely inundated with all manners of the mentally ill: furries, trannies, bronies, lolicons/pedophiles, diaper fetishists, etc.
I firmly maintain that going F2P was one of the worst decisions made in TF2's history. Sure, those types of "people" will always be a thing and they probably still would have joined the TF2 player base eventually, but losing even that minor barrier to entry (TF2 used to cost $10) immediately catapulted the game into the depths of degenerate hell. You couldn't join a server in 2012 without half the lobby being bronies, and it only got worse from there. Of course, the game being free also makes it cheaper for dickheads to run bots.
Suffice to say, TF2 going F2P and its consequences have been a disaster for the game's well-being.