If your whole team camps spawn, leaving you with no choice but to also camp then that can really be a true factor, even in team games where team work really doesn’t count, having a half way decent team who actually moves around and goes for it is important to your survival. A new map you don’t know will make you lose a lot but learn it and you will be fine. some people do better in certain types of maps than others.

Camping upgrades, especially armor can lead to victory, but skill will tare it up. a noob armed with full armor and a BFG can still get owned by the pro with the glock. real pros don’t camp too much in a multiplayer game, it tends to get them banned.

In the end PRACTICE, and the intelligence to figure out enemy movement while mastering your own will make you a king of any decent FPS. with practice your aim and skill with all weapons will improve. not everyone has the smarts to learn what cover and good dodging is. some gamers don’t want to experience the game enough so they camp at every opportunity.

Lastly, for your own sake don’t leave a game just because you are getting slaughtered. push through and play there a lot, your skills will develop until you are just as good as everyone else on those servers.