Super paper mario is ok. It's just kinda bland all around.
The main gimmick is switching between perspective and its cool for like 5 minutes. The problem with that gimmick is that theres is nothing really there. Usually an obstacle that you need to pass but that's it. Long stretches of nothing for most of the game, its so empty. Combat is straightforward, you just jump / use hammer or character abilities. No more turn based combat, no more thought involved. it just sucks.
There are no buddies that tag along with you, well that's not true but they are just stupid ass shapes with a certain ability and 0 personality. Pretty much take the characters from 1 / 2, wire-frame them the fuck up and there you go. The characters and the dialogue from what I remember are pretty good and luigi actually does something in the game. The art direction is ok, everything is too stringy and springy but it fits the game well considering the location of the whole game being in some pocket inbetween dimension. I do remember the colors being very vibrant though. I never really had any incentive to discover all the recipes because the game world is boring and there is nothing fun or extra to do like the pit of trials or something. Thats about it, worth a play through honestly.