Fuck it, I'll do a top 5.
1. Super Monkey Ball: Banana Blitz - Some of the most intricate levels ever crafted exchanged for baby's first marble madness. Some of the most fleshed out minigames in any video game ever exchanged for waggle based distractions that are fun for maybe 10 minutes. What a complete and utter disaster.
2. Paper Mario Sticker Star - This one is a cliche at this point really. They took out everything I liked about the others. The RPG mechanics, the fun story, funny writing, neat locales, combat that felt like it actually served a purpose. I've seen people defend this game by saying it's more of an adventure game than an RPG, but that doesn't make it good. It's an adventure game with a bunch of annoying backtracking and no reward for any of it. Usually "adventure games" excel at least partially because of their story, see all of the classic Lucasarts PC point and click adventure games. Sticker Star doesn't have any of that.
3. Final Fantasy: Type-0: PSP importers, please tell me what you were smoking, because this game has basically zero redeemable qualities. An easy to cheese combat system in a way where the cheesing isn't even fun, wildly fluctuating difficulty, a story that most fan fiction puts to shame with some of the stupidest OCs and plot twists I've ever seen, corridor level design....what's there to like about this game? The combat can be fun sometimes when you're not cheesing, I guess.
4. Professor Layton vs. Phoenix Wright - Shu Takumi's return to the Ace Attorney franchise is met with a resounding "meh," with cases that are mostly underwhelming and a final case that has a plot twist that seems cool until you think about how ridiculous it is for a bit. I had never played any Layton games before and I can definitively say I wouldn't enjoy them after these puzzles.
5. DanganRonpa: Ultra Despair Girls - A really, really poor modern Resident Evil-like, with finnicky aiming and a story has uses child abuse in the most tasteless way possible, complete with one dimensional characters. The level and encounter design are very bland and repetitive. My hopes for this game weren't super high but I still think it might be the worst game I've seen to the end, at least in a very long time, which earns it a spot on this list.
Honorable Mentions: WarioWare Snapped, Pokemon Sword & Shield, Final Fantasy IV DS, Animal Crossing: New Horizons