Like others have said, short burst I prefer 3-6 shots. Get your aim back then go again. If really close, spray and shoot the dead body. And one last thing, make sure you remember you are fighting the enemy and not the wall behind them. I know thee wall may be pretty and all but it isn't a threat at this time. One more thing, rushing can be good if done correctly. Take the game of chess for example (NO ONE TALK ABOUT THIS I AM DEAD ON), a very interesting strategy, but an also very effective one if mastered, is let the king lead. Now think of it this way, if the king doesn't lead his men into the fight, who will? Now put your place in the spot of the king, tell your team to rush in after you, and if they notice you follow your word and not try to trick them to their death, they will follow you, the king, as you lead them into battle. Chess FTW!
~MEGA