This perk is forced on you. Since everyone uses it, it is a must have on all of your classes. Not only does it increase grenade effectiveness, but it makes grenades less effective against you. If you don't use the perk, then your grenades are useless and you can get nuked by frags. The perk itself is bad design and must be removed. There is no tweaking that can be done to help make this perk balanced. If it is removed, then they should not add a perk that also makes grenades better or worse. Because, then we would have to use one of those perks. It would be like the Juggernaut and stopping power perks in COD 4. You would have to use one or the other. If anyone supports this stupid perk, then let me know in the comments below.