Not really. I started out playing with subs and got good with those then went on to diamond ars and had to totally change my playstyle now I suck at using subs. --- Now I lay me down to sleep, Bottle of whiskey by my feet. If I die before I wake, tell my friends I drank it straight.
Well, I've gotten every single weapon maxed and diamond, so I feel qualified to answer this question:
Use something different every game. Just try something crazy. I went 34-12 the other day using a Skorpion with Rapid Fire and a Target Finder. Give a silenced Executioner a go. Experiment with Overkill loadouts. Put on two flashbangs and two stun grenades. Use a Five-Seven and six perks.
If it's performance you want, can't go wrong with red dot/stock/quickdraw M8A1 or FAL; or a long barrel/quickdraw MSMC.
Alternatively, get to gilding the M1216. It's pretty fun to use.
Alternatively alternatively, use this: http://bo2rand.xmajikx.com/ Random class generator. Gives some pretty interesting combos. --- The One Bar Warrior. GT - Vanessa Magick
this real man got a nuclear with his silenced scar-h besides if the recoil is so bad that you are going to miss about 25% of your shots (inb4 noitrez says im bad) you might as well silence it --- 90-2 M27 Nuclear/Triple swarm http://youtu.be/fvi62gA7Tiw The 4 bar warrior.