Completed the game at the weekend.
I had quite a few rage moments, while the game is pretty simple and easy in parts, it really, really gets annoying when you're out of painkillers and just die easily - even playing on normal.
I can't imagine the patience you'd need to do the New York Minute Hardcore achievement (that's New York Minute in a single playthrough without getting killed - if you get killed you restart at Chapter 1!)
I just can't get used to the controls in multiplayer free aim, it's just too sensitive to me. I nearly gave up then tried the soft lock lobbies and I'm hooked! So much more fun (even though it feels a bit cheaty)