Good FX can't save a bad movie, but bad FX can make the experience of a mediocre movie worse. And for all it's flaws, TFF actually has a lot of heart and quite frankly feels the most like an episode of TOS, more than any other movie. Fixing the bad FX and animating the Rockmen sequences would go a long way towards making it a little easier to watch the movie.
I would gladly rebuy TFF (and TMP with all three main cuts) in deluxe restored versions on Bluray.