Do not listen to all the reviewers. It may be short but this incredible game has the potential to keep your attention.
The game is somewhat reminiscent of COD4. Quality over Quantity. But the game itself is just pure fun. The colour design is one to be celebrated. The cut scenes show hours and hours of work and it is so much fun to run around the city.
Despite the critics complaints the combat is indeed something to be enjoyed. There are several ways to take down enemies and many ways to get there.
The story is also a brilliant one and even if you don't like that game mechanics themselves you will love the ending regardless. At least buy it for the ending.
It is true that if I had payed $100 for it I would probably feel a little ripped off, but if you can get a cheaper version go for it. You will not regret it.