Everyone has access to the same upgrades in MW2.  If you are annoyed by the upgrades that othe people are using, then earn them yourself so you can use them too.  Level the playing field.  If you are camping in MW2, you are going to get killed a lot.  The person you killed from your camping spot can look at their killcam and find out exactly where you are, then communicate that to his/her teammates so they can take care of it.  Campers don't usually last long in the servers I've been on, and I have spent MANY MANY MANY hours playing this game.  I have never been overly annoyed by campers or nukes, or anything else, and I come from a long history of playing online shooters.

Your answer to one person using tools to make camping godly is for the other person to do it too?  That just results in more campers.  It isn't like the sit in the exact same spot, they will usually camp a small area and have other campers all backing eachother up.  Even if you make your way back to that area they will have moved slightly and you're likely to be shot by one of the covering campers before finding the one who killed you first.  The best way to rack up kills is to be one of the campers with a couple backing you up.  Never mind the completely stupid amount of killstreaks in the game, chances are the campers will set-up somehwere they forces you intot he open to reach them, meaning you're gonna die from harriers and such just trying to get near them.  The comminacate with team idea is nonsense, half the time they don't even speak the same langauge and even if they do most people don't wanna listen.  Using a preset party is not a good front for good game design, fact is the vast majority of players just jump into matches, after that most commonly parties are 2 or 3 people tops.

The definition of insanity is doing the same exact thing over and over and expecting different result.  If you get killed by a camper once or twice, no big deal.  If you continually get killed by the same camper, then you are an idiot.  Find a way to get the guy out of there, and chances are he won't be camping there anymore.  If you don't like the extended knife range, quit charging into areas before making sure they're clear first.  Toss a couple of whistlers into a building before storming it.  Use some strategy.  If you use strategy in MW2 and learn the maps fairly well, campers will be toast after one round and will leave.  Or they'll just stop doing it. Personally, my biggest annoyance in MW2 are the guys who are actually really good at the game.  The campers are usually the shittiest players on the server.

Again with the fighting groups of campers, that stuff you posted may be great for hunting one single camper, but they roll in packs commonly and even if you kill one another will get you while you kill him, by time you go back for number 2 number 1 is back there again, nevermind the 3rd or more.

BTW, campign was a huge problem in BF1942, BF2, BF2142, BF Vietnam, and BF Bad Company.  I used to spend a lot of time on TotalBF2.com and TotalBF2142.com, and the biggest point of contention on those forums was usually people sniping and grenading too much as well as people camping.  In Battlefield, if you can sneak over to a fixed spawn point of the enemy team, you can just pick people off as they spawn into the game.  This is camping at its worst and it mostly happens in BF games.  If someone gets a good spot behind your home base spawn point and knows all the different places your team will spawn, they will absolutely dominate your team for the whole round. 

I don't know why you talking about old games since things have advanced since them, for some games anyway, MW2 not being one of them.  Look at MW1 compared to MW2 and MW2 actually has more things that benefit campers, it is going in totally the wrong direction.  What you are complaining about is spawn killing anyway, not camping.  The two are completely different.   If you try and camping in BC2 you're facing a lot of things that work against you, killer-cam, spotting, loss of cover because it gets destroyed and so forth.  Battlefield is a lot more objective based too so camping means you're gonna end up losing.

You'll get people try and camp no matter what but at least in BC2 it isn't beneficial to camp and will not work for very long before you cannot.