Oh gosh, we're talking about all my high school-era fantasy loves now! (Well, and some of my not-so-beloved books...I regret reading so many of the Wheel of Time books, it took SO long for things to happen and looking back I'm pretty disturbed by the way women were treated. But...I know lots of people really like those.)
Mercedes Lackey is one of those authors who I can't help loving even though her books are massively cheesy. Lots of nostalgia there, and I still read her books as a guilty pleasure now and then. (She was also the first author I read who wrote gay characters, which was pretty eye-opening for teenage Kiraly living in a conservative small town).
I loved the Belgariad and some of the Terry Brooks books too. I read a handful of Shannara books and somehow never noticed the similarity to LOTR until years later when one of my housemates went on a tirade about them. The Magic Kingdom books were entertaining too, sort of reminiscent of Piers Anthony's Xanth books which I also loved (even though I probably missed like half of the references).
And the Redwall books were one of my first great reading loves - and probably, come to think of it, my first fandom. Not only did my friend and I make a gingerbread version of Redwall Abbey one year, but we also got a large group of our family and friends together for an actual Redwall feast, complete with costumes. We actually made Turnip 'n Tater 'n Beetroot Poi (pie), which was not as tasty as the books made it sound.