I think it is an issue of poor game design that makes maps like Wet Work inherently unfun because of nade spam. Individual servers can try to regulate abilities like nade spam that are so overpowered that they make the game unfun but they often fail. One reason is because regulating that sort of thing is incredibly difficult because you have to do it manually on a player by player basis, which on a server that is open 24/7 is nearly impossible. The other reason for failure is that servers regulate too much and ban every single perk and ability that has ever upset them, without any real consideration. This turns into games where the only two weapons allowed are the Scorpion and direct impact from Flash grenades. This is why game developers are basically the sole controllers over whether multiplayer game play is amazing or tiresome. Foruntunatly nade spam is one of the few gameplay issues with multiplayer COD4. Maybe we will even see this issue fixed in the future with a Patch or by the introduction of new perks or weapons.