I'm playing on normal with no problems really. Sometimes I die, yea, but it's never really that frustrating. Pro tip, don't rush into where a load of enemies are, they shoot you, duh. Hold back and pick them off individually. Pretty basic FPS strategy.
^[DISCLAIMER]This post is probably sarcastic, don't get your knickers in a twist[/DISCLAIMER]^
Cheers to G a c k t for the stolen sig