No it's not a quite significant bonus tbh. 50% more damage at vet3 on rifles, airborne troops, rangers...that's a significant bonus, 25% less received accuracy is a significant bonus, but anything in the order of 1-10% is not significant in COH world.
Well, you gain those high value bonuses by fighting (gaining vet should be that rewarding), not by just choosing pre-game perk, as well as they apply to one unit only. In CoH2 it seems that those bulletines will benefit all units or at least a kind of units (at guns, tanks etc.) so you have to multiply this bonus for each unit produced which is bestowed by this bonus. I also always had the impression that even 5% damage reduction on vet1 Wehr tanks is highly beneficial, even on a single panther