Not sure what you mean about the Mirror's Edge or Assassin's Creed thing?
I mean you climb but it's more like traditional climbing like in Uncharted or something, not parkour.
The game is ropey as hell and if you ask me those are bad American voice actors doing bad European accents but for the right price it's worth it.
The water dynamics are certainly very cool.
Yeah, the climbing, balancing, etc. It's a little more high intensity then AC because of the nature of what's going on and where you are. It's not like in AC you have all day to shimmy up this big 'Ol tower over there.