[Taramafor]

Crouch for better aim.

Use cover.

Plan where to put your certs. Do you want to be stealth and hack stuff or heavy and blowing stuff up or a heavy hacker or a driver or a medic? Personally, I always have the heavy suit (2 weapons is just too good an advantage). Penetrator with AP rounds can down MAXES in a clip and fire rockets and more importantly jammers (so know your weapons) and cycler is good for accurate and suppressing fire at range. I also have infiltrator suit, AMS, engeener (glue gun) and phantom (stealth, yay). I'm a jack of all trades I guess. But you can decide if you want bigger guns, tanks or better gadets in a certain field.

Use surpressive fire (It will keep their heads down even if you don't kill them when they come out).

Move WITH people. The best thing I like about this game is that people move up as a single unit and hit the enemy in one solid blow instead of zerging one on one (ala, PS2). Which means never ever over extend unless you're an infiltrator. And if you ARE an infiltrator, it's all about small movements when crouched to not be seen (and staying still when they look your way).