Mungo Rook

Okay so here's my thing.. I'm really pleased with the Halo 4 multiplayer gameplay but I am super pissed off about the grenades.. Like wtf? They are COMPLETELY pointless. Literally they do damn near nothing unless you stick someone with a plasma and half the time they bounce off of whoever I throw them at. I'm severely displeased with this. This is the first Halo game where I have had an issue with grenades.. I don't know if the power of the grenade was taken down drastically or what but it gets on my damn nerves. Grenades are how I ******* fight and I can't even use them on Halo 4. Even with the "Explosives" support upgrade.. Does anyone know what the hell is going on here?