I just got this the other night. I don't disagree that there is a lot of repetition. I can see why some people would not it as much. But this is not a game that's meant to be played in a straight line. I'm an explorer, so I always attempt to hit every high point and find all the nooks and crannies above and below the rooftops. Plus I like to toy with guards... walk up to a dude, assassinate him, watch a guard wander by, assassinate him, rinse, repeat until eventually there are seven or eight bodies scattered throughout the street.
Early thoughts on this game: it's good, and it has a decidedly non-linear feel that I really enjoy. The Sci-Fi elements of the story are somewhat jarring, but I've only completed the first assassination and the story is starting to get interesting. So that may change. The combat, though simple, is incredibly visceral and cinematic.
Overall I think it's a good effort for the new IP. I think if they do the right things, the second game could be really interesting.