Fun, addictive, but simply lacking to many promised features.
It's fun, everyone I've introduced to it likes it. But it's lacking many features that you'd expect in a DOTA game, or that were promised by RIOT games (LOLs developer) long ago. The game hasn't had a new map in months (there's only two). There is no replay system - despite being promised in beta. The tribunal system, bots vs. ai, features that were promised by never implemented. For the past 8 months, all that's been released are new champions, despite the old ones being broken.
LOL is a fun game, but its developers blow.