I still don't get why stacking KS makes people want to camp simply because say with the pred, harrier, pavelow setup why would you even consider camping to get that, it just doesn't make sense with stacking KS.
Whereas without stacking KS which is blatantly obvious with black ops people camp because they have to get the killstreaks from guns only.
As long as MW3 gives low KS say cutting off at 15 kills and non game ending KS then I say make them stack. I find non stacking KS personally slows the game down for me it just gets boring otherwise, I'm not bothered even if the enemy gets the KS up first as there gonna come down straight away anyway.
Stacking KS are way more beneficial to objective minded players anyway, because you can get on with planting etc whilst your KS does all the work.
Just to clear something up when you say "camp for KS" in MW2 I have a vision of someone sitting in a room all game trying to get there KS, or do you mean say if you rush the enemy spawn get a pred go hide to drop it get 2 kills with that stay in the same spot drop your harriers hang on say another 10 seconds then call in the pavelow then leave that area after say 30 seconds total?