lol everyone knows about that, or if they don't, then thats sad, jus sayin...
My hints:
1. Every weapons class should use Ninja, there are a ton of ppl with heartbeat monitors, if you have this perk you will have an advantage over them, they look at there sensor every few seconds, if you pop out of no where, they might be lookin at the sensor at that time and you can pop them quickly and usually recieve no damage. jus a lil heads up for ppl new to the game
2. The SCAR and ACR have the best damage as assault rifles
3. The Mini-Uzi is the most powerful sub-machine gun (my personal fav with silencer and rapid fire)
4. Marathon is a bad perk overall, do not use it if you have slow reaction times, you will be ok with it if you do have good reaction times
5. Use hip-fire once and a while, will save you a few milliseconds and you will usually win the fight over the other guy who goes to the red dot or whatever scope they are using (hip-fire with Mini-Uzi is deadly)
theres a few for those noobs lol jks