Legue is alright, it lacks in some things other mobas have and it seems the newer mobas are all copy/pastes of league. Take for example Infinite Crysis, it has the same system of one special passive per hero, and items increasing both melee and magic dmg. The graphics also feel weird, but hey it's only my opinion, and I bet someone else totally disagrees with me. Arguing if it's a good game or not isn't the point here, you just have to list your best games.
Anyway, for me I suppose it's Dota since it's the only thing I play nowadays and I play it with class mates. If you want something to spend time on, get WoW. They say it's gotten worse, but it can still get addictive.