Hell yeah they're gross!
They are beautiful and very entertaining
More often than not, yes, they are either gross or poorly written. Not all are but the vast majority are. Thus I couldn't bring myself to pick the "beautiful and entertaining" choice even though a rare few are.
My fan-fictions leave you drooling for more.
Not all fan fictions are about romance, outright bloodbaths, and sex.
We'll it depends on what the fan fiction is but assuming its reasonable then no
Granted, lots of them are self inserted stories, but there are fanfics out there that are incredibly enjoyable, despite he fact it was probably written by a 16 year old girl. Writing fanfiction also helps young writers practice their skill, and when they're ready, they can make their own books. So if you don't like fanfics, it's probably because you don't know how to find the good ones.