Melancholy of Haruhi Suzumiya - I hate Haruhi's character, Kyon was fine, but the rest of the cast was kind of bland. I was also never a fun of this early Kyoto Animation artstyle (main reason I stay away from Clannad). The supernatural stuff was interesting and gave me some good Steins;Gate/Monogatari vibes at times, but I wanted to skip all the slice of life parts. There's also this experimental as fuck episode order which seemed like it was done only to make this show stand out as "unique". I think I've read somewhere that this is where a lot of character archetypes originated (or at least became popular) so I'd probably have a different reaction if I watched it a decade ago.
I'm kind of interested in watching the Disappearance movie, but I would have to go through Season 2 first and even fans seems to dislike it, because of the infamous Endless Eight.