If they catch me by surprise i try and go for cover and get a lowdown on the situation. But the best is jumping out of a blackhawk after landing it, seeing loads of troops. Going "oh shit" then jumping back into the blackhawk minigun and mowing them all down.
Who said the blackhawk sucks. Just land that thing! I got about 20 kills before some dedicated AT guys got me whilst in a landed blackhawk on the airfield in Wake, plus it's easy to turn because you just hop in the pilot seat, turn it abit and jump back in the guns, choose left or right depending on the situation and blow them away, there's no running from that thing.
I really went off topic didn't i..