Yup. The 1977 animated Hobbit and Conan the Barbarian are definite poster children for movies which diverge from the source material in ways which were kind of infuriating for purist fans lacking perspective (as I have been, at times) but are surprisingly good in their own right.
Today I can be disappointed by the abridgements in the 1977 Hobbit and still scratch my head at its weird portrayal of elves, while recognizing that it is generally quite faithful and uses some of the best dialogue, that the animation is generally excellent, and that the casting and voice acting is absolutely stellar (Orson Bean, John Huston, Richard Boone(!), John Stephenson...).