I prefer sniping, but I quickscope on occasion. I view it as a valid tool, and I actually think it takes a lot more skill to master than a lot of people whine about.
This is the same as people who used to call for certain button combinations to be banned from fighting games because they couldn't defend against them. That was sort of the point of putting in the time to learn those combinations. It's not supposed to be even, in a fight you give yourself every advantage possible.
And don't whine about realism because in any game where you can run while shooting and still hit anything, the game you're playing is not realistic.
This is the same as people who used to call for certain button combinations to be banned from fighting games because they couldn't defend against them. That was sort of the point of putting in the time to learn those combinations. It's not supposed to be even, in a fight you give yourself every advantage possible.
And don't whine about realism because in any game where you can run while shooting and still hit anything, the game you're playing is not realistic.