Normally I would use flashbangs so the can't see the C4 being thrown. I don't ever use frags or stickys because they can hear them and move just outside of the kill radius and throws me off as to where they are exactly.
I love hunting good campers, most satisfying kills especially if they got me a few times. The truth is I enjoy all styles but staying alive is my specialty. I'm not one of those guys who goes 25-25, I prefer to finish 13-5 (tdm).
nicedrewishfela mentioned another good strategy against campers. Get the lead and then out camp them. It makes for a somewhat boring game, but if the enemy campers want to catch up, they have to go out hunting. A camper wants people to rage and run at them constantly. It makes for easy kills. The bane of a camper is a team who communicates well and thinks before rushing headlong in.
suicidel tendencies.. shoot first ask questions later. HAHAHAA!!! don't be haters because you people are getting capped half a mile off from the wizard eating drone with a golden gun. can't we just all get along.
I got a good revenge kill on a camper yesterday. He was camping by the train on magma, and shot me in the back as I rounded the corner. I went back to get him, ended up crossing paths with another enemy in front of him, and he got me again while I was reloading.
I went back thinking there was no way this guy would stay there now that I knew where he was, but sure enough he was still there. I rounded the corner and took him out before he even knew I was coming. Felt good.
I have no problem with camping. Usually I just make it my goal to kill them.