Ways to have fun in Black Ops:
Play with Low Killstreaks
With lower killstreaks, you unlock fun things quickly. They give you points faster and also, if you wait around, killing a lot of people to get a helicopter, isn't some bastard just going to shoot it down in just a few seconds after its initiation?
Don't just keep playing when you are already level 50, only to unlock new guns. If you prestige, you get to start all over again, which means you get to keep receiving the enjoyment of doing challenges, getting mass kills and unlocking tons of stuff! I recommend it!
Use Low Level Guns/Equipment
Use the Enfield, Olympia, MP5 and all those different guns! If you do, you will find yourself a good player because it seems that the lower level guns are bad. Your mind automatically perceives that you are good.
Please, if you do or don't find this post helpful, post feedback and PLEASE post more ways to have fun!