Xanth was okay in junior high. It's a fluffy, easy read, but not something I ever need to read again. I think the Split Infinity series is Anthony's best. However, when I look to reread Piers Anthony, I usually go for Bio of A Space Tyrant -- another fast easy read.
Nobody mentioned the Belgariad by David Eddings. To me, that's fantasy lite, also suitable for around junior high level. Some people swear by it, though.
I got tired of Wheel of Time around Book 5 or 6. Never finished it. Someday I might get around to it, like in twenty years. How tired is it to have a protagonist of questionable parentage who is an awkward fit in a village where everyone has a different physical appearance?
Deverry's good. I almost put that series in my first post, but decided not to just list every fantasy series I liked.
The Fey series by Kristine Kathryn Rusch is pretty good.
Funny to talk of Stephen Donaldson, but nobody has mentioned the Chronicles of Thomas Covenant.
Pern was okay in the late 70s/early 80s, but I'd have a hard time recommending it to anyone now. IMO, the genre has moved on.
I think Feist is hit or miss. The first set of Riftwar books were very good, then he's had ups and downs after that. It would be interesting to see him try a new world. Other than the first four books, I like his wife Janny Wurts' Daughter of the Empire series better than the rest of Feist's.
@YJ: It was a joke. No page numbers. :)