I played both LoL and Dota 2, started with the latter because my boss and a coworker played it and invited me to give it a shot, since free to play. I actually have over 1000 hours of playtime in Dota 2, and I have no freaking clue how I accumulated so much time, it never felt so much. >.>;
However, just like with LoL, I barely played any actual PvP. Usually I stick with singleplayer/co-op vs. bots.