I was in high school when I started reading the Dragonlance novels. I actually started with Legend of Huma, one of the offshoots not written by the Weis/Hickman duo, but it was enough to get me interested in the main series. TSR had just released the older books with shiny new covers around that time, so I snatched them up and devoured them quickly. To this day, that's one of my favorite fantasy worlds. They did a lot of things right in those books. The cast was large, but varied and pretty well defined. Their world felt alive with cool little details (c'mon, who still doesn't want to try Otik's spiced potatoes), none of the main crew were perfect heroes or 'chosen ones' (except maybe Raistlin, but even he was "evil"), the banter between the characters made me love them early on, and there was a lot of humor in the book as well, especially with Tasslehoff. I laughed out loud for real when I was reading plenty of times. They had tons of dark, serious elements as well, but my god man, you got to have something more than the standard, often humorless cliches that are rampant in so much fantasy these days! So yeah, Dragonlance was my gateway.
I honestly don't care for too many of the fantasy novels I've read in the last......oh I don't know, 15 years since too much of it doesn't hook me for whatever reason or another. Hated 'The Name of the Wind' with a burning rage, have struggled to get into Goodkinds stuff or The Wheel of Time series (though I think I can, just gotta really be in the mood for it), and GRRM lost me by the fourth Ice and Fire book (both the GoT show and the books are too soapy for my tastes). Most fantasy worlds are just boring, repetitive, or too dark and depressing to be any fun. Sure, you can have darkness, even need it, but for the love of mighty Tolkien Himself, how's about a world where we can actually picture the characters living in it when they're not fighting the Big Bad Guy? Love her or hate her, JK Rowling was genius in this regard. She had managed to show us a lot more of the world beyond just the standard stuff. There's special magic food and drink, a sport (complete with it's own world cup), slurs and slang terms (Mudblood, Muggles, Squib), a freakin' magic based Rock band (The Weird Sisters I think they were called?), characters that managed to be both whimsically funny and tragic (looking at you, Dobby), two awesome comedians who's pranks you can root for (Fred & George), a system of magical government that functions but isn't too bogged down in politicking that it gets to be a slog, magical artwork (them paintings, dawg), their own special newspaper, and a ton of other stuff that I'm probably forgetting. That's why she wins. You want to go there, despite the dangers.