Now I'm not complaining too much about snipers, but the guys who sit there throughout the entire game and just wait. I see it all the time in my Kill Cam. Some guy will be sitting there doing nothing and as soon as I run through their sights, Boom! Dead.
There is no skill involved at all. Be tactive. Be a team player. Sneak around corners and try to get kills. I love coming up from behind a camper and knifing them in the back. It's a big F You to the campers.