The stupid so called "Blue". I mean, it's nice fun to figure out ways to freerun to get to your destination. But then those stupid cops start shooting at you and you don't feel like playing any more when you keep dying.
The main criticism of the game is the ridiculous combat. When trying to speedrun the shard I feel like smashing the controller to pieces - not only do you have to wait for the lift, you have to get through the most frustrating part of the whole game - taking out the computers, the three guys on the stairs and then also try to avoid the other three who follow you up. The most ridiculous part of it all is that you have to run right up to someone with a machine gun in the hope that they stop shooting and instead try to hit you with it so you can disarm them. Damn annoying! The others aren't as bad because you can avoid almost all of them.