I'm pretty sure there's a vast difference between defending a spawn area and just flat out camping in a corner fishing for kills on anything that moves. I think it's pretty tactical to snipe in one spot for a little bit before shifting your position to keep your enemies guessing. I'm talking TDM-wise on that note. Camping can be acceptable on objective-based game modes like Demolition and Search & Destroy, where it's really just what you need to do in order to win. I don't mind it as long as I'm not being spawn trapped up the nines, because sometimes I just can't break a spawn trap and that's where I start getting frustrated. =/