It's called the "revenge" grenade. I don't see why that booster would help you when there are better slot 2 boosters. Revenge won't help you get better in any shape or form.
Also dropping grenades upon death is revenge. It has a negative connotation around here. Here's a good reason not to use it: Although it can't kill your teammates, it can put them in a down state which would let them get killed by an enemy.
I laught at people when they start moaning about revenge , everyone use revenge and im ok with that if you think that its over-powered then use it it seems to be atleast much useful than all the other boosters to be honest , you will say team safe ? who cares about team safe its useless in competitive modes . I only use it in co-op wich is more useful , monkey man ? I don't want to climb fast you will be killed anyway if someone behind you , daredevil ? hence you can pick up any weapon its not useful besides if you play with m9 everyone has it so its no prob for amo .
atleast i use revenge to prevent me from any camping who wants to sneak behind and kill you and in plunder and team objective its so usefull .
Lets face it, the game now is full of good players, the only way a new player is going to get any kills is by using revenge. You may get the odd few that have experience in similar games but that is going to be a serious minority. We live in the COD world.
For a F2P or new player Revenge is going to be vital to getting any score at all with todays player pool.
I mean, even during 4HK FAL, FAL users struggle against even an AK.