Depends on the placement, oftentimes you can walk out of it. In addition, yeah, you're slow with no radar, but any other subclass using double charges on you would mean you're dead already. I'd rather be blind with a chance than have already lost. Having a ranged melee is annoying as well, there are severe drawbacks. Going to shotgun+melee or just melee and ending up throwing a smoke at a corpse or straight past an enemy when you wanted to stab them, or vice versa, wanting to smoke someone who's shotty rushing you and finding out the hard way that you're too close, meleeing them and getting closer when you're trying to flee. Lose your charge and the combo is gone, left with a crap grenade. Try and use your smoke while you're being rushed and it can make things worse. Wombo combo has loads of drawbacks people just ignore, but it's necessary because the grenades on NS are plain bad on their own. Not a single good one.