Goatbrush: Bit of a post and run as I'm on my way out but it's more a gameplay mode than a game in general.
I guess the best way to explain it would be with Left 4 Dead 1, then 2 for me. I love the games, I've completed most (maybe all?) of the campaigns on expert in single player, but back when I used to play it I really wanted to play Versus. Thing is, I'm intimidated by the community and not really willing to put up with how toxic I know some of the players can be.
I don't really mind multiplayer games in general but it's just the team element of it and the thought of being raged at because I'm not all that familiar with the tactics people use in that particular game mode. Similar reasoning applies to MOBAs, I've been playing some Heroes of the Storm but I haven't really played anything team based except when I have 4 friends online.
It shouldn't really bother me. I don't really have a thin skin, I play a lot of multiplayer non-team based games and I don't really care if I suck at them - just something about the team element with strangers gets to me and makes me question my aptitude.
I wouldn't bother with their community either. A bunch of nasty little wankers. Really put me off the game which is a shame.