I stopped playing WoW because of how cancerous the community was.
I was one of the best tanks on my server in one of the best guilds and I fucking hated it. I liked the idea of being the best and getting the best gear before anyone else, but I hated everything else about it. I hated how it felt like a second job. I hated how serious everyone took the game. My most memorable moments in WoW weren't from raiding and playing with the "friends" I knew from my guild, but from leveling alts and playing with randoms and doing dungeons with them as well as casual PVP encounters or pub battlegrounds. They were infinitely more fun.
About when I started to realize how much I hated almost every aspect of serious raiding, those aspects started to leak into the rest of the game. By that point, everyone had a DPS log addon, everyone was posting their times to third party websites which logged your times and other stats through third party programs. Even public groups started to request times and achievements and that escape from raiding with my guild became less and less common.
That experience basically ruined my entire outlook on online games. Especially multiplayer co-op games.
Nowadays I basically only play single player games.