SND kills are currently 250xp at the moment, right? Also I find that on a good game of SND I get around 10 kills but a good game of domination I only get around 20-25 (Without score streaks)
You should also try SND flanking/rushing. It's not really strategic but once you get behind the enemy you can get all 6 kills and feel so bad-***.
They plan on fixing that soon, but I don't like SnD. I like being able to respawn, I don't want to be killed by some camper and wait five minutes till I can play again.
Usually I just go do something else if I die. Also, eventually you learn where they camp and to avoid those areas. Some routes are absolutely amazing on black ops 2.
On a different topic, what do you think about useful sound being removed from the game? It seems like most youtubers are going crazy about it but I don't see a huge problem.