I agree. Perhaps not wholeheartedly, as there is more going against the films than just that, but I am certain that they are more difficult to market based on that very quality. Excellent point.
As for Mr. McAvoy, if you feel every frame of KOTCS is evidence of its low value, then clearly there are no redeeming qualities and even a fan edit couldn't save it. Makes me feel bad for all those who took the time to do so, especially that TMTYC guy. ;)