In my opinion the Modern Warfare 2 multiplayer can be improved, which by the looks of it, most people would agree with this statement. 
 
It can be improved in a number of reasons which I will only list as this is not my main point. Respawn Points, Grenade Launcher, Akimbo and finally the way the game rewards you. 
 
Now these reasons could be argued for hours on end but I don't really want to focus on them instead I want to focus on the mentality of a COD player, because I think this is the main reason why COD multiplayer is flawed. 
 
The reason I think the players are at fault for making the multiplayer poor is because they are always looking to win striving for an improved K/D ratio as that is what they believe to be most important about the game, not having fun, and for many people they will do anything to improve it, whether it be by turning into a Commando Kid or noob tubing. It could be said that these need to be fixed by IW (because these two things are problems in my opinion). Could one also not say that the player should realise that these are cheap tactics and will probably spark abuse from other players. 
 
I was wondering if anybody thought the same, similar, or completely different.

They really need to fix the spawn points...that should come before anything else.

Wow, really another one of these topics? 
Also what some people get enjoyment out of tends to piss others off, especially in adversarial multiplayer. 

I would definitely agree on the fact that the players are the problem.. there will always we loop holes in MP games for players to abuse, and there will always be players to abuse them.. Personally i try as much as i can to keep it clean, but will often fell like it's a hopeless battle.. The players abusing the "flaws" in a game like MW2 will always have the edge, and in most cases it will lead to frustration in the players trying to just have fun.. :/

 Nothing wrong with noob tubing. Takes skill and time to get used to the proper height, especially when you're shooting from a distance at a window or objective. If you want to avoid getting killed by them I would suggest not going to predictable locations. Noob tubers rely on knowing where people like to go, then shooting grenades there.