I had been a long time PC player and was used to dealing with server browsers in UT/CS/Q3, but I was getting sick of them. When the game comes out, its brilliant, servers running with standard rules and a nice map variety, absolute bliss, but after a few months people start making 200 frag servers on 1 map and they take over, to the point it becomes a pain in the arse to find a server (thats populated at least) at the time you want to play with some level of "standard" rules and maps. Add to frustrating ammount of shit servers owners put on them which meant you had to download sounds/textures and in general bullshit (which fucking sucked on 56K) really soured me on multiplayer. Sure, you could add favourite servers which suit your needs, but if when you want to play nobody else is, you either hunt for another server (needle in a haystack) or just fuck it off.
Battlefield 2 really made me hate the whole set up, the game went from something I utterly smashed non stop to fizzling out as I was sick of the same damn map being played on conquest with ridiculous ammounts of dumb rules and extreme scores to end the match ..... just for it to be the same map again, and again, and again ..... and the same thing happened with BF3/4/1, not bought BF5 because at this point its probably dreadful.
BLOPS was a funny one, great again at the start, but then as always it happens ......... crouch only nuketown rules out the arse. I was glad MW2 took the matchmaking route, I had 100's of hours of straight forward no nonsense gaming, even if it was a bit laggier than a dedicated server.
The last thing I want to do nowadays is have to hunt down a normal ass game with a normal ass ruleset. CS GO competitive mode is brilliant. My only gripe is I would have liked an "inbetween" mode between casual and competitive, same rules at competitive, but shorter round limit and have it cycle through maps (rather than having to find another game).
When I first got my hands on Halo 2, despite not really liking the game that much, the multiplayer system was fucking brilliant, and im glad it took over.