It should come as no real surprise that a lot of the original films by Netflix are not that good.
Some (at least ones I have seen and heard of) are pretty terrible. I would say that Roma is not one of them, but that is a putrid understatement. Here is one of the best films of this or any year, and to say it is not worth seeing because it is not in English or in color would show how shallow you are as a movie goer.
Nothing else to say 