Depends what you mean by spawn camping really. If it's blatent out and out spawn camping, as in sitting on the runway in Gulf of Oman in a tank raping the base when it's not the only flag left, then yes, it's spawn camping and it's a pain in the hole. But it happens. It happened in BF1942, it happened in BFV, and it will happen in BF3. The way I look at it is, how the f**k did the tank get there in the first place, and let's go get the bastard. Gave up getting pissed off about it a long time ago.
Then again, although I have never done this, the likes of a sniper 'camping' on the carrier is kinda ok with me. I mean, again, you have to ask, how the F**K did my team manage to let him get there, and instead of all screaming abuse at him, let's go get him. His escape routes are kinda limited...
It's like plane/chopper whoring, idiots driving off in APCs on their own, TKing muppets and assholes punishing you when the TK is their own fault- It happens.