The video you posted was of a blob being destroyed by two well place abilities. What is amazing is how poorly the Soviet player chose to play. Not only did he lead the charge with low health shocks (who died before the grenades went off), but even after the first nades fell he refused to retreat. The OKW player also spaced out his men and used cover helping to limit the number of causalities from the shock grenade.
Not sure if you are saying there is a problem with grenades or just showing off a blob being punished. If you are complaining about grenades please only post videos where both players are using equal amounts of skill (preferably at a high level), and a failed game mechanic cheats one player out of a win/victory.
Nevertheless, destroying a whole 5-6 squad blob with 20 muni does make ones eyebrow raise.