These are some of my strategies I use:
1. Reload before every kill. That way you don't run out and have to reload after 2 shots.
2. Throw a grenade only from a distance not right up close, unless it's a plasma/spike grenade.
3. If you know your about to die, throw a grenade into the crowd or under you so you might have a chance of getting a kill from the grave.
4. If you have a shotgun or mauler (maybe) aim for the head (what I do is jump over them and shoot the top of their head, instant head shot.
5. If a guy is starting to shoot you from behind, make a sharp turn around a corner and crouch (crouching in the game makes you invisible on the radar) and if you want throw a short grenade on the ground where you think he will walk by.
6. If you see a guy throw a grenade, jump and move away from where it was.
7. If you see you've been stuck, throw some quick grenades at the guy.
8. If you have a shotgun/mauler in a small area map or something with lots of turns (snowbound, guardian, maybe the pit in the hallways) crouch behind the energy shield wall (snowbound) or just behind a wall and when a guy walks by, blow his brains out. If you didn't know the mauler is a one shot then beat down kill and shotgun is sometimes like that but usually instant kill.
9. I'd never really use a gravity hammer in an open area because people who see others with gravity hammers usually walk backwards and shoot so it would be very hard to get him .
10. Never go into a big group of enemies (maybe unless you have some sticky grenades) without a teammate or two.
11. If you see a rocket flying toward you, jump.
That's all I can really think of right now. Message me if you want to ever know more.
