I feel like the common belief that "most of the EU was bad" is hyperbole and/or at least partially subjective, at least if we're talking "classic"/post-ROTJ-era, speaking purely percentage-wise (I'm not familiar with the prequel-era or old-Republic era, never cared for that stuff). I'd argue that if you made one category that included the classic Star Wars movies + the old EU up until the prequels, and another category that was just all 7 of the Star Wars movies, the former category would have a higher percentage of stuff that wasn't pure garbage. Some of the old EU was awesome (Thrawn, X-Wing series), a lot was at least okay and at worst added a nice bit of lore, backstory, and diversity to the Star Wars universe (The Han Solo and Lando Calrissian novels, Truce at Bakura, Black Fleet Trilogy, Corellian Trilogy, etc.), and the stuff that was objectively terrible was just SO terrible and SO retarded that it stood out, speaking Crystal Star-tier as well as the Trioculus bullshit.
Most of the shit that's generally considered "bad" by a lot of people, sans the aforementioned flat out embarrassing stuff, is less to do with objective quality and more to do with what people think "belongs" in the Star Wars universe. I'm talking about stuff like the Yuuzhan Vong and the Dark Nest Crisis. Maybe it's just me, but I never really had an inherent issue with having a more broad variety of things in Star Wars that weren't explicitly focused on the whole Jedi/Sith dichotomy. Why? Because I always liked Star Wars more for the feel, mix of sci-fi and mysterious fantasy, and art style. Regarding the latter, one of the main reasons I hated the prequels before I was even old enough to understand that they were objectively shit as movies was because everything looked "wrong"; it didn't have the Ralph McQuarrie look that we all know and love, and as for the former what I mean is weren't you just as fascinated with how huge and mysterious they implied the galaxy was when you first saw A New Hope?
People don't have a problem with going all out in Star Trek - I mean how many enemies has the Federation faced? The Klingons, the Romulans, the Borg, etc., there's so much diverse and isolated stuff in that universe, they never felt the need to stay on a very specific narrative and theme. I don't see why Star Wars shouldn't be similar, hence why I never had an inherent issue with the Vong. Dark Nest - yeah, it was kinda weird, sure - but inherently, why not? It makes the entire galaxy feel alive and full of many different things that aren't inherently related to each other, which oddly enough is, contextually at least, more realistic. Granted, the EU did overuse Superweapons, but that was almost a defining trope of Star Wars due to the original trilogy for fuck's sake. I mean they rehashed the Death Star by THE THIRD FUCKING MOVIE, don't act like the movies didn't set a precedent. Yeah yeah, the Sun Crusher was ridiculous - IMO, it would have been better if it didn't have invincible crystal armor, the rest was fine, but to be fair even the invincible crystal armor had a reason for existing - to survive supernovas.