Thousand year door had better character and enemy designs, in paper games since sticker star it's mostly your standard mario fair plus objects.
It's a miracle that they finally can give them toads some different clothes and use origami characters to bypass the not altering existing character rule. such a stupid rule in all honesty why would they do this. paper mario got miyamoto'd big time.
https://www.nintendoenthusiast.com/paper-mario-producer-kensuke-tanabe-modify-mario-characters/
Paper mario was known for it's whacky designs until sticker star that took all that creativity away. bosses are objects or koopalings. ever noticed how even in origami king the standard enemies are pretty much all standard mario fair. npc's and bosses are downgraded designs aswell it's not even a contest. This entry they just camouflaged it by them being origami folds. as I'd like to say the new super mario bros look.
https://www.mariowiki.com/Paper_Mario:_The_Thousand-Year_Door_bestiary
https://www.mariowiki.com/Paper_Mario:_The_Origami_King_bestiary
Thousand year door had a more interesting story and side objectives that touch them finer details and have depth wich could easily be missed, origami king while massively improved compared to color spash while entertaining lacks it allot.
Sticker star onwards with origami king clearly being the best of them 3 games pretty much dropped the rpg element and story aspect and have more focus on being an action adventure game. especially in origami king
Aside from the paper gimmick art style it's hard to compare old and new paper mario games
Thousand year door is an rpg with an interesting story that has complex side topics at times
Origami king is all about the paper gimmick art style and visuals, not to mention a more action packed battle system with puzzles, it's easier to pick up and play. why don't they just turn it into a super paper mario game already it has some non turned based battles after all just drop the turnbased system already if you want to drop the rpg genre anyway.
paper gimmicks are nice and all, but paper mario 64 and thousand year door just so happened to have a paper gimmick art style, most older fans don't really give a damm about that, what they loved was the story and lively world and the rpg battle system. if it had a paper art style or not would make zero difference.
Modern paper mario took all of that away and only focussed on the paper gimmicks art style literally ignoring what the older fans liked about paper mario in the first place. as myiamoto liked to say who needs a story?
At the very end of the day it's all about preference because old and modern paper mario are pretty different. aside from the paper gimmick art style and exploration while losing creativity in character design thanks to restrictions by nintendo, allothas changed what people liked so much about the original in both content and actual gameplay.
if you like an actual rpg slower paced game with an interesting story 64 and especially thousand year door are for you
If you like a more action packed game, a less deep but satisfying story and a game that looks nice origami king is for you
again modern paper mario has turned into an action adventure game with a simplified story that is accesible for all ages, Thousand year door is an rpg with a cool battle system and finer details in it's story and side quests.
This ain't about nostalgia I've played the game years later past it's release different genre's really.
I could definitely see why people either hate or love origami king but both are different genre's of games I'd say. Can you really compare the two. Paper mario has turned into something else really. Unless you where in it for just the paper gimmicks exploration since the beginning I find it hard to imagine how you could compare the games.