Alas! Though I agree that most LOtR fic is terrible.

"The better the canon, the worse the fanfic" does seem to be a rule, sometimes, doesn't it?

Although now that I've said that I have to admit that I've never read bad Vorkosiverse fic. Oh well. ;-)
And, of course, if sovay were to write fanfic, it would be good fanfic. (Please don't mock and taunt me by writing Ron Weasley/Eragon/Darth Vader/Marie Antoinette crossover mpreg incest fic, Sonya? Even though I'm sure it would be the one readable specimen of the above in all of space-time. :-)