I'd be keen to avoid situations like DA:I where the effects of the things each of the 3 three basic classes can do seem curiously similar, but I get the point that most soldier types don't have many active alternatives.
It doesn't bother me personally as I don't do MP, but I'm quite OK if they actually add stuff for variety that isn't strictly 5e; they seem to be adding "special" attacks depending on the weapon type selected, there's no reason to not add a few other abilities as long as the effects aren't silly ( by which I mean a martial feat that knocks the target back or down is sensible, but a martial feat that encases the target in a block of ice is silly ).
I've never much liked the idea of adding variety through things like critical success/critical failure either, it always seemed a bit lazy. I guess the obvious thing for combat specialists is to derive something like a stamina stat that is used up depending on action chosen and weapon/armour used, but basic D&D never seemed to go that route ( unless 4e did, I've never looked at that ).
