I agree with most of them except the Panzergrenadiers. If used well these guys are legendary. I have sent countless number of Riflemen, Conscripts, MG team, AT guns and mortars packing. I've only failed to send one squad packing. That was the shock troops squad
You do have to treat them with kid gloves until they reach vet 2, as they are quite fragile for their cost until then. But yeah, they can easily flank and turn a fight around. And once they get vet 3, with supporting LMG Grens? Let the carnage commence, nothing short of vet 3 Shocks or double 1919 Paras can survive.
Against shock troops I just tend to mix a flame pio among my Grens until they get their LMGs and vet.
Bottom line is, Ostheer is a very good faction that is solid at all stages of the game. They have a blind spot in T4 but if you play your cards right you don't really need it anyway.