If I don't have access to grassfed meats right now, eating raw grainfed beef will be better than any other foods?....
If you compare to eating those steaks cooked eating them raw would be better! You are asking if due to the quality you may be doing something bad, depends, but you are not making them ANY better when you cook these same steaks, if you eating shitty meat it remains shitty and get even more shitty when you cook it. Actually the cooking may mask the shittyness and then you are eating a camouflaged poison, invitation for getting sick. So yeah eat them raw. And you'll learn to recognize which ones are better quickly. Even in the times I decide to cook my meat I taste it raw before hand to know what kind of crap I will be eating ha ha
I eat a mixture of grass-fed, grain-fed and grass-fed grain finished, or grain supplemented meats, mostly raw unless I am sharing the meat meal with family and making it for everyone to eat...I have had supermarket grain-fed meats raw which really did taste bad. But some of the organic or just high quality grain-fed ones I gotta admit taste really good.
I have been eating quite a bit of goat, deer and now ELK (nom nom) raw in the last week or so and I don't think those are 100% grassfed at this time but they usually are raised on both dry grass and grain over the winter. In winter its difficult to get pure grassfed and even the ones that eat hay I bet are supplemented with grains. However the "closer to wild meats" like the deer and elk taste so much better then the average grainfed beef. But the "high-class" grain-fed beef can be heavenly (have no clue what they do to it to make it so yummi). The grassfed beef is nice though because its saltier! It all comes down to taste and of course how you feel over time after eating the particular meat, some raw meats I notice do a lot more for me then the factory meats, so obviously have way more nutrition in them.
If you can't access grassfed beef see if you can find deer, goat, elk, lamb, bison, caribou, moose....the latter two I never tried but heard they are amazing. Can't wait to give moose a try....
Another reason to try and not buy factory meats is if you love animals...I they should have a good life right up until the time they become dinner! And for a farm herbivore a good life (relatively) is out in the pasture or in a shelter barn in the winter but not in metal cages, we farm them and eat them so lets give them some respect to at least enjoy their life as a pasture animal ><