The obvious parts and level design really ruined it for me, There is this one bit that i just keep going over in my head, over and over.
In some underground subway area, There is a chainlink wire fence door, there is a gap between the ceiling and the top of the door that faith could squeeze through. But no, you cant. INSTEAD you have to wallrun and jump over a massive gap to the other side, activate a switch to deactivate a massive fan that has no safety covers or anything like that, you know giant fan, futuristic city, you would figure their OH&S people would've pounced all over that. But anyway, crawl through the deactivated giant fans to get to the other side of the door.
I mean Fuck, I'VE climbed over stuff like that, WHILE DRUNK.
And then there was the broken door, with a lock in the janitors office...... one lock. to unlock this ONE DOOR. To get to this janitors office you must run up a wall, leap off the wall and swing across a bar and climb up a catwalk.. where the railing is conveniently broken.