Trying out a higher sensitivity and this happens...

[Oleh]

(My emblem isn't FAIL, i don't know why it is like that, my emblem is

[PaulMacC]

Lower sensitivities are generally better. Most professional players in the MLG circuit run with sensitivities of 2/3.
You are playing hardcore, so you dont really need to be accurate anyway

[marine]

I play on 5.

[Oleh]

I did use 2 but im on 3 now, it seems to be a huge increase in sensitivity. I generally don't like the Gears of war feel to core now since they upped the HP and remove Stopping Power

[Chris]

I used 2 in all previous cod games and at the start of bo but switched to 3 recently.

[samsaBEAR]

I hate using lower sensitivities, I feel so uncomfortable/slow/lumbered down when using them. It's the same across all games, even non-shooters