That's not NATO spec, but a worldmilitary spec term for military mistery meat.. "tastes like chicken"
No, some might taste better then other, and contain better ingredients.. but Russia is very under estimated, the russian military is making a large comeback in the last few years.
All military rations are conserved, boiled etc.. so you won't get sick from them..
They also contain enough vital things like calories, minerals and vitamines..
A military is only as good as it's food.. without food, whole armies come to a stand still
It's as important as weapons, ammo, medicines, vehicles and all the other stuff..
Starved soldiers can't fight (look at Stalingrad) they DID have "enough" ammo (captured weapons)
Offcourse not ideal ammounts of ammo, but they could sustain a battle with it.. (they did not really need antitank weapons in the ruins of stalingrad > vehicles couldn't get through the ruins, it was all infantry and artillery)
Primary reasons Stalingrad fell is because they froze to death and all supplies were cut.. no food was entering stalingrad for the germans.. (it took 7 months! (of which 4 months starving because they were surrounded))
Even the Russians .. the ones that did that.. learned from it

Soldiers need enough "good quality" food to fight..
The 1940s and 1950s defination of "good quality" is "stuff that doesn't cause diarrhea or kills you"..
And all military rations are therefore edible.. taste is just a luxury, but I'd trust to eat all military (conserved) rations from all nations in the world.. Yes, NATO spec might be better quality.. but that doesn't make russian rations bad
And come on.. You should have a little confidence in the people that launched the first satelite..
