Depends on the game, maybe even the map of the game. Snipers were god damn useless in Battlefield 1942 because they couldn't effectively cap or defend a flag. And despite the fact that snipers regularly got either murdered or ignored by everybody else and earned lousy scores, servers would be full of losers afraid to get their hands dirty in real battle.
I had more respect for good snipers in Team Fortress 2. The maps were contained so that snipers would sometimes have to get in the thick of things, and a skilled sniper could be a real asset. Dropping overhealed heavies in a single shot, killing doctors before they could uber, or even just defending their team from other snipers. They were probably the third hardest class to play effectively in that game, so I still hated noob snipers for not rolling up something easier so that they could actually contribute to the team.
As for camping, I viewed it as a legitimate tactic in both games. Generally a waste of time compared to actually fighting on the front lines, though.
"The worst part about these reviews is they are [subjective]--and their scores often depend on how drunk you got the media at a Street Fighter event." — Mona Hamilton, Capcom Senior VP of Marketing
*Image indefinitely borrowed from BrainBoxLtd without his consent.
