Similar to? Hard to say... Gameplay-wise, I find it similar to the Far Cry series, really. First person shooter with a big open world and some RPG elements. But of course the setting and tone are vastly different. It's also kind of like a dystopian future version of GTA. But it also has more emphasis on story than either of those, and player choice actually makes a difference in how the story turns out. That, combined with multiple possible character builds gives it some good replayability value -- you can play it through once as a bulky nomad whose weapons of choice are grenades and heavy machine guns, and then play it through again as a slick former corpo who turns invisible and slits throats in the dark, and the experiences are different enough to make it feel like a brand new game. Plus, you know, the game world is pretty huge and also pretty dense, with lots of little nooks and crannies to explore. On my fourth playthrough right now, and I'm still discovering a few new things I'd never seen before.