Hmm... Finished after 4.2 hours of gameplay and ... I want another one :D
The game's... Well, the best meele fights in FPS history stay, IMO, in Dark Messiah, but those in Zeno Clash are interesting as well, thou auto-lock and unability to hide your weapon when not locked onto someone are some sort of punishemein in my opinion, since they can make the whole thing so frustrating - besides these 2 things, it all comes down to skill and reactions, which is good. I've enjoyed the fights mostly, so I guess they were ok.
Now, to the important parts:
Story. It kept me going, it was mysterious and very well-written. Yeah, I liked it very much - and it fitted in the world perfectly
Now, the game world. It's great. Fantastic design, there's always something to look at and some locations will be stuck in my head for a very long time, I'm sure of that. Characters were great as well, very diverse and... Well... Let's say interesting for lack of a better term :D
This game is definetely worth buying and I think I'll finish it a few more times. I want a commentary mode!