I would not consider it camping. Patrolling an area is an effective tactic. I regularly head in the opposite direction of where my team is going, as patrolling a separate area of the map makes my team more effective; the only issue I run into by doing this is I sometimes encounter multiple members of the opposing team at once, which usually is not a good situation to be in.
I had an incident yesterday that could be considered "camping" on Favela. I was in the building that has the banana leaves just outside. I was using Claymores with Scavenger, so I had a claymore setup at the door. Watching my radar I knew I had an opposing player behind me, to the side, and in the distance because my teammates were being shot at in each of these areas. Knowing this, I hunkered down hoping my team would clear one of the areas and I would be able to move from my positions; they did not. I managed maybe four kills between my M1014 and claymores while sitting there waiting for one of the areas to clear. I was killed by a well thrown Semtex, otherwise I may have continued to sit there because the area was still very hot at the time of my death. I may have been "camping", but it was only done because I was pinned down and I was not going to run senselessly to my death, especially when I was continuing to get kills at short intervals.
I do not have a real big issue with camping; granted, I am annoyed by it, especially when most of a team effectively holds down one area, but it is generally not a smart idea to continue running into the same trap multiple times. Doing so only leads to frustration/anger, which further causes your gaming experience and gaming abilities to suffer. It is a better idea to keep a cool head and try a different approach to counter the opposing team. I just thought of this, but it is a good analogy of my thoughts while playing Modern Warfare 2, MW2 could be thought of as a slightly more violent version of chess. By that, I mean your opening, mid-game, and end-game strategy may need to be adjusted to counter what the opponent is throwing in your direction. Just last night, I noticed myself getting frustrated in one game and realized it was because I was making the same mistakes over and over. To fix that, I needed to try something different. I did the best to straighten my thoughts out, tried a different approach, and because of that, I was able to turn my score for the better. The results may not always be good, but keeping a cool head will help out more than being angry.
Remember, Modern Warfare 2 is a game and the point of a game is to have fun. It is not worth stressing or becoming upset/angry about this game because someone is playing better than you currently are. If I was getting dominated, then most likely I was doing something wrong and I should have adapted accordingly. Furthermore, negative games should be viewed as a learning experience, as those games teach much more about proper tactics/strategy than a positive game ever will. It is what you make of getting dominated that determines your effectiveness at and future enjoyment of this game.
I was more making a point I've spent far too much time fiddling with the weapons.
But the pinnacle of the of the noobish setup was the guy would miss me with the whole clip, then switch to akimbo G18s and need about half of each clip from those to drop me. Just one of those combos where they really aren't planning on killing more than a few people before they die/run out of bullets.
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Demolition, went 25-22 with FMJ + Holo TAR. Only five penetration kills off extended mags, I had at least seven penetration kills in that match alone 
One was penetration through the bomb site at A (er... whichever one is in the middle of the alley) 
