This game looks great. The earlier levels in particular are bright and verdant, with amazing blue skies and long views over beautiful landscapes; later levels start to get metallic and rusty and are less impressive, although still a visual treat.
The acting in the cut scenes is fantastic, and you develop a real empathy for the principal characters. The story is somewhat blah, but not too bad.
The gameplay... well, there are three aspects to it: combat, puzzles, and climbing.
The combat is frantic but repetitive; there are only a few combos to learn, and you learn them early on. From then on it's just button mashing.
The puzzles aren't really head-scratchers, and are mostly clearly signposted and easy to work out.
The climbing is too linear. You can't jump anywhere where there isn't a handhold so it's impossible to fall to your death, there is usually only one route to the destination, and so it becomes a case of just pointing your stick in the direction you want to go and jumping.
So the gameplay is the weak link, but despite all this I enjoyed the game. The design & characterisation helped a lot, and the story moved along at a rapid clip, set pieces were well-structured; it wasn't too hard, wasn't too easy. It reminded me a lot of the Prince of Persia series, of which I'm a fan.
I'd recommend it overall, but am quite aware that it's shortcomings will be more painful to other people than they were to me.