Its not just grenades, I used my warlock melee charge 3 times in a row against a hunter who was shade stepping and he took absolutely no damage. It wasn't lag either because everyone had perfect connections. Hit detection and grenades, even supers are not working properly. I hit 3 guys with a direct hit with a nova bomb and they all walked away with 5% health. And yes I was using vortex nova bomb. Bungie needs to look into hit detection and fix it