Chivalry - Medieval Warfare suprised me. It has the best first person melee combat I've ever played, both easy to get into and extremely difficult to master. It kind of reminds me of the good old days of Street Fighter II because the moves seem straight forward but the deeper you go down the rabbit hole, the more complex they become.
Note: I've bought this game a month ago, along with Mount and Blade: Warband. While the latter is by no means a bad game, the combat is nowhere near as good as Chivalry's, there's just no comparison. When you charge with a vanguard, do a swipe and take two enemy heads, it "feels" like your sword connected. M&B doesn't have anything like that, I suppose a lot of its value lies in single player and mods.