Super Evil Megacorp's lovely MOBA, Vainglory, was the only game on stage at Apple's iPhone 6 presser earlier this year, and now it's available as a free download from iTunes. It's so great.
I've been playing with the game for a few weeks, thanks to iTunes accounts in other countries, and it's been a blast. It's a MOBA streamlined for mobile play and optimized perfectly for touch controls. It plays good, looks pretty damn sexy, and I can regularly win matches, which doesn't happen very often.
I'll have a more comprehensive look at the game later. For now, go check it out for yourself. It's free, for crying out loud.