While I often write about science fiction, I actually grew up on trashy fantasy novels. Well, maybe not quite trashy. Certainly formulaic. More than one Dragonlance novel imparted a subtle grace to my bookshelves as I grew up. Seemingly the very definition of stereotypical characters, written as part of the TSR Dragonlance roleplaying game. This is certainly not to impugn the writing of Margaret Weis and Tracy Hickman. The character of Raistlin for example, provides an interesting look at the balance of morality. Long after I stopped reading the tales of Raistlin and Caramon, I've continued to read other series by these two. The Rose of the Prophet trilogy was particularly memorable, and took a somewhat more nuanced approach to morality and religion, showing the power of the gods as different aspects of an integrated whole, and the quest to regain balance.
The Darksword trilogy took a different look at magic and technology, again with elements of self-sacrifice. This series was memorable for me as being my introduction to the idea of a city inside a bubble.
One of the most important novels I believe either author has written is actually Tracy Hickman's novel The Immortals, which examines quarantine death camps for those inflicted with AIDS. This novel is actually science fiction, not fantasy, but the message it contains is a powerful message against hatred and brutality.
Other series I read growing up included Anne McCaffery's Pern novels. In grade 6, we actually studied the Harper Hall trilogy in class, which was the first time I studied a book for class which I had already read.
I was also a fan of Raymond E. Feist's Magician series. The Magician: Apprentice and Magician Master, as well as the Empire trilogy cowritten with Janny Wurts are still among my favourites.
David Eddings' Belgariad was fun, although again it tended to oversimplify some things. The whole "this country is a jungle, that one is a swamp" thing sort of seemed a little like the Ice Plant Hoth, the Desert Planet Tatooine after awhile. Definitely an epic fantasy.
Among the more recent fantasy series have been those which more closely follow historical periods. Guy Gavriel Kay's works are great. Tigana is a great novel about the importance of memory. His most recent novel, Under Heaven, is a great story influenced by Chinese history.
I certainly can't fail to mention Jack Whyte, who has written one of the most interesting tales in the Arthurian legend, covering the span of time before Arthur is crowned king. Whyte's novels are told mostly from the viewpoint of Merlyn, but in a way which completely avoids the use of magic, in a much more realist setting.