The action is good. The story is stylishly done, but looking back on it, not particularly interesting. This is a game about the action, the shooting, the jumping, the moment-to-moment gameplay, the "what's around this corner" moments, the "oh-fuck-oh-fuck ohhh fuckkkk moments" and it does it well. I really, really had fun playing this game and I was incredibly addictive.
That said, the whole experience isn't that memorable. The action is tight, but that's about all there is to it. If you want a good third person shooter, come here, but there's nothing revolutionary.