For fun, I tried to use amazon ratings as a method of picking out good fantasy series. Some of these may have been culled from past "what fantasy book should I read next" posts here and on officials. The short list:
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<br>"Kingdom of the Elves" series by Robert Stanek
<br>Thomas Covenant books by Stephen R. Donaldson
<br>Baroque Cycle by Neil Stephenson
<br>Earthsea books by Ursula K. Le Guin
<br>Coldfire Trilogy by C. S. Friedman
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<br>Only one of those I've read any of is the Baroque Cycle. Read the first half of the first book, then got bogged down and never picked it up again.
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<br>If you want to go "classic" there's always the Elric of Melibone books by Michael Moorcock, and the Amber Chronicles by Roger Zelazney. I read both of those series 15-20 years ago and enjoyed them.