Do I need to say more? There is nothing to be feared about them. Grenades should be feared, instead everyone just walks trough them...
1. Duskfield - It never freezes guardians in pvp, it does not block and do anything. Players just walk trough it. You should really be afraid of this grenade, it should freeze you almost immediatly, so you are afraid of it and you need to find another path to walk around and not just go trough it...
2. Glacier - Shatterdive + glacier combo was in its own league, but after the nerf...yeah, you just use this to cover you, its crap otherwise.
3. Coldsnap - umm, yeah ok
Do something for the grenades Bungie, make them stronger.
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The chill effect could use a 0.5-1 second duration buff and have it linger after leaving a duskfield since chilling is pretty useless right now. Other than that, the rest of stasis is pretty balanced