Donít be THAT guy. You know that guy who just runs around doing whatever the hell he wants for points and dies a billion times because of it. Unless you are a pro, you should be using teamwork with everyone on your side. Communicate with your teammates and donít all pick the same killstreaks. For instance, someone using the spy plane will reveal targets on the map which other killstreaks can take advantage of like mortar or napalm strikes. Plus, letting your teammates know where all the enemies are is helpful.
In fact, Black Ops is more generous in doling out experience points for team-based actions so it works out in your favor. Additionally, being a part of the winning team that goes on a victory streak as opposed to the #1 player of the game will in all likelihood level you up faster than being a one-man army.
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