I think Super Paper Mario received criticism it didn't deserve. I'll say TTYD was better, but I've gotta be fair and say it's not all that much better. Super Paper Mario still has the same imaginative world, has a pretty damn good soundtracks, a solid story with an excellent ending and the gameplay, yeah, it's not turn based, but that doesn't mean the 2D platforming is some of the most creative we've seen in a Mario game. A lot of the same ideas like collecting enemies and the Pit of 100 Trials are still there. Really the only thing I didn't like was that your partners weren't well developed characters and just clones of each other. But at least they all had their own mechanic that the game has use you use plenty. Even in later stages it'll still make you get out your old partners now and then.
I do think I like the turn based gameplay a bit better and prefer the atmosphere that TTYD presented, but that's completely opinion. The final world in Super is just as thrilling as in TTYD. I think I may even like Super's final world a bit better as in the end of TTYD the game suddenly changes the melancholy mood it created by playing a underground theme remix until the end. Castle Black really feels like the world is going to stop breathing if you don't stop it now. Overall, Super Paper Mario was a very creative game that did well in both gameplay and story.
Sticker Star was... OK. I actually did like the battles unlike many other people and the world was nice for what it was. I mean, it did have the basics of the previous games. World 4 was nicely done. The problem is just that it lacked the uniqueness of previous installments and was too confusing. If there's anything irritating it's not being able to take a portable game with you because you keep needing a fucking guide to know what to do. Oh and, well, World 3 was dragged to a point of insanity.