Make sure you wait until after the titles as there's a significant chunk of the game that comes after, and it makes the whole game make a lot more sense.
Control is superb, but tough. I play in normal mode and have found the game demands you master your weapons, abilities and applied enhancements, and match them to the task at hand along with a well developed strategy.
Can I compare it to other games? It's something like a mix between Res2, Dark Souls and Alan Wake.
Casual gamers should chose easy mode, which is clearly designed to be a comfortable experience. Those demanding a tough challenge need normal mode. Those wanting severe punishment can play on difficult mode (I suggest this mode is only played on a powerful pc, capable of delivering at least 60fps).
On all its a great, original game. There's also a couple of expansions coming soon, so there's plenty to keep you busy.
Well worth the release price.