Almost exclusively DOTA 2 for years now.
Recently though, I also started playing GemCraft - Chasing Shadows (Give it a try, it's the absolute best Tower Defense game you will ever play). I'm nearly 90 hours in, and I want more of it! Not bad for a TD.
I also really enjoy adventure games, and two days ago, I finally got started on Grim Fandango. I'm really liking it so far; the humour is spot on and the plot starts to be really intriguing now.
Oh and I also still play Napoleonic Wars every now and then.