As for fan edits, I think the only prequel that’s unsalvageable is The Phantom Menace. Doesn’t matter how much you edit it, there’s still not a relatable main character in sight unless you dub Jar Jar or something.
TPM is quite okay as it is to be honest. Obviously not good but still watchable. I can easily relate to either Qui-Gon or Obi-Wan. If you somehow cut out Jar Jar, there are very few annoying things left. On the other hand, AOTC is in fact unfixable. There is a clear main character and he is super annoying (much more than Jar Jar in TPM). I cannot see how anyone could even remotely relate to Anakin in AOTC.