The grenade perks were a baaaaaaaaaad idea. They should have known better, they've been problematic in CoD since CoD4.
Combined with instant respawns and yeah...
I think this is a result of instant respawns + resupply armor mod.
My biggest issue is running out of damn ammo on a main weapon. There need to be at least the starting weapons on the map spread out or some ammo spots. If you use a DMR and most others are using BR you are screwed or you need to pick up a BR.
I was actually referring to the single player.
Been playing on legendary and I'm instantly noticing an increased amount of grenade spam, I don't like it when the game logic bends for your enemies (no reload and such), would be nice if they made a game where your enemies run out of ammo or atleast run out of grenades.