I think some of you are confusing dud scripts with overall quality of the product as a whole. There are lots of TOS episode duds, but, with a few exceptions, the acting is always solid as is the camera work, editing, etc. By those measures, no fanfilm ever has been TV quality, as admirable as the work might be.
An episode of TOS cost what adjusted to inflation? 1 million?
People keep saying some fanfilms are as good as the professional shows, but they're not. The cost may well be partly to blame, but I think there's more to it than that, especially since these are labors of love instead of professional productions (even if there are some pro people involved).
None of which is to diminish what these people accomplish. I'm just being realistic about the result.