Nadespam problem? Since when was nadespam a problem? The way I see it, the problem is you spending too much time in the grenade kill zone. If you're far away enough from the enemy, they can't throw a grenade far enough to kill you. If you're very close to the enemy, you should be engaging him in close quarters, not waiting for him to throw a grenade at your feet. And if you are anywhere in between, then you should get closer/farther away to the enemy as quickly as possible! Otherwise, if you are in a situation in which you cannot easily close in with an enemy, or you don't have a line of sight with the enemy from far away, like if you are in a trench network, then that is the perfect situation for which grenades should be used as the best weapon to defeat the enemy. Why is this then a problem?
Rarely do I get killed by a grenade and think, wow, grenade spam. Occasionally, I do think that. Most of the time though, I think, I had that coming or I took the risk by running into this field here where I know it is raining grenades. See what I'm saying?