Pretty much what you should do with most any gun. Except at close range.
Galil is better.
FAMAS is bandwagoned. Of course you'll get killed by it a lot. By a ton of idiots too stupid to use a better gun.
M16 is a G11 with attachments, but worse in every other possible way. /only uses my handy M16
K, I agree with everything except the burst fire thing, so that's all I have to talk about.
If recoil is manageable, you don't have to burst fire at mid range. I don't need to burst with the AK74, Galil, Mac-11, Skorpion, or one of the first two LMGs (can't remember which...) at that range. The problem with the MP5K's recoil is that it has this awkward recoil that sort of paints an outline of the enemy in bullets, rather than a consistent directional one (MAC-11 is slightly up, Skorpion is negligible, etc.)
Having to burst fire at a lot of ranges absolutely sucks. However, the MP5K is a good enough weapon that you can get away with it due to its damage output. If I had to burst fire the Skorpion at nearly all ranges, it would be a million times worse than what it is.
I think a lot of the more rapid-fire SMGs in this game have manageable recoil at mid range, unless the enemy is behind a box or something. And by rapid-fire, I mean the ones with high standard RoFs, not the attachment.