I've queued this in Gamefly, which goes to say that my opinion is that it's not worth buying without trying.
I'm hoping for that Devil May Cry / Bayonetta kind of progression, where as you improve you become untouchable and super-cool. If the flight/rappel stuff is solid and strategic (and reliable) I know I'll have lots of mindless fun in this game.
What actually made me pull the trigger was the multiplayer stuff they scratched toward the end of the video. Kinda had a Helldivers/Planetside feel, where there's like a 'global' campaign and everyone's just out chipping away at the objective by playing multiplayer. I'm into multiplayer carrot-on-a-stick stuff like that.