Accepted by whom?
If one wants one's game to be accepted by individuals who only mostly play commercial games, then yes, it must be up to commercial standards.
This, however, is not unique to RPGs. If one wants one's research to be accepted by scientists, one must get one's research published in a fancy-to-do journal. Or, if one wants one's game to be accepted by Germans, one must write it in German.
Yet if one wants acceptance by individuals who do not mostly play commercial games, then not.
One should always write to one's audience; the trick, of course, is in determining who that audience is.
Just a shilled,
Thought