Vainglory! In case you already didn't hate you life enough because you play Dota 2 or League of Legends, now you can hate you life and existence anywhere on the go! It's available on most android and apple devices and the website is here:
http://www.vainglorygame.com/In all seriousness, I think it's fun. A friend and I have been playing it a sh i t ton for the past two weeks. If you've never played a moba and wanted to, or are looking for a coffee break quick moba to sate your disgusting desires, i'd recommend it.
Add me @ RogueAntigone. Become pro with my friend and me so we can all do ranked together. It's gonna be cute.