I think it's pretty great, and definitely better than NSMBU which you've mentioned a few times here. It is of course more similar to the 2D entries than the other 3D games, but the level design, despite being more linear, feels like what you'd expect from 3D Mario in terms of its creativity and variety. It also feels wonderful to play and move around, and has two of my absolute favorite Mario powerups ever. (the cat suit is shockingly fun to use) It's definitely more fun in multiplayer due to the nature of it, and if you have the opportunity to play it that way, I do recommend it, the Switch version has online multiplayer. If not, it's still very good in single player as well, but I do think maybe slightly less so. Bowser's Fury looks like it may be a really cool single player addition though, based on what they teased of it.