Anyone who says LoL doesn't have a bad community has never played it, even in non-ranked games people troll and harass you like you just killed half their family, even though you only lost a tower or something like that. I haven't yet played any ranked games, but from what I've heard it's even worse there.
I really like mobas, the skill needed to be good is much more versatile than that needed to be good at a shooter, as you really have to know who is where, what exactly is happening, when to cast your spells, etc.