My little brother bought this game for PS3 and I had the chance to play it over winter break.
The concept of the game is great and the graphics are sick, but it's just so damn repetitive. I got sick of it after like the 4th assassination.
Thats true, the gameplay can be repetitive.
Actually the secondary missions and the climbing.
Climbing can be challenging but since the buildings differ considerable, it cant be that boring.
But some other secondary missions can be very challenging and the slightest mistake may ruin your efforts. This causes frustrations, esp for the novice players and it can be the reason to quit the game.
Luckily i only tried the pc version, which is the only with a great variation of secondary mission, so you wont have to finish the ones that you despise avoiding them is an option, to advance further on without frustration.
Later on you get new gadgets, you try new techniques and there is always smth interesting/different to do.
By the time you reach the last levels, this routine wont be a challenge anymore and the will to see the end will make you an unstoppable killing machine,
but the ends lets a lot to be desired...