I like to thing I was pretty good, actually. I managed to keep a 1.4 K/D while sharing an XBL account with someone that was HORRIBLE. Accuracy was something around 22.35% at rank 55 1st prestige, which was inside the top 300,000 (or top 150,000 if you don't count half of those due to impossible numbers). Not trying to argue, just laying the basis of my argument.
That said, camping was still viable in MW1, and I could actually take a good deal of satisfaction from a successfully executed camp (it seems that it's a lot easier in MW2. I will disabuse them of that notion rather quickly.) Although I will still maintain that playing Vacant and Shipment are just asking to be corner camped by shotgun d-bags.
Truthfully, camping should be a major viable strategy, realistically (and by that, I mean real-life wise). Running and gunning is a nice, romanticised way of playing a game, but would get a crap-tonne of people killed if attempted in real life.