Did we say they were useless? I was implying that AT rifles that later upgrade to Panzerschrecks, are more than plenty (considering how both will be available with a player who acttually knows what they are doing) to deal with any Allied Armor that the Ostheer will encounter. AT grenades aren't needed for the Ostheer.
The Soviet AT nades are quite useful, but don't forget until Soviets hit the tank depot they have only TH or a Pak, both of which aren't quite efficient vs. later vehis, so the AT nades are a stopgap, for Guards and THs to ward of the earlier arrivals on the battlefield, before the Heavy armor hits the field. They do their job, but they don't home onto tank, which isn't really needed in their case because this AT nade is free and there is no upgrade to research it.
And RedGuard, I can't say that Stickies can't be used on a player who knows what he is doing, the damn things home onto tanks and considering that Allied Rifles can be spammed and then have 3 or 4 of them use this ability to kill off a PZ4 at Vet 2 for very few munis. Most people just spam rifles against Tanks because a few Stickies and an un-upgunned Sherman (usually not needed from experience) and I just lost a Panther or an Ostwind, then they retreat and repeat, having a seemingly endless supply of munis.