So your saying the game mode "gungame" in black ops is abuseful to? There is no abuse in this game mode. It would just take skill to get better at the game type.
It's a type of gameplay where you reward success greatly and punish failure very harshly-- in short, it creates a very large gap between the "skilled" (or lucky) and "unskilled" (or unlucky) players; much larger than the gap that already exists between skilled and unskilled players.
Gungame is, essentially, highlighting a major issue (the skill differential) and then making it worse.
There are people who enjoy this sort of thing, but sustaining a group of players of mixed skill levels is difficult without a great deal of foresight.