"Yay!" - Super Mario
From the minds at Nintendo comes the biggest 2D Mario yet: Filled with over 80 courses of non-stop jumping and dodging as well as 4 player multiplayer support, you'll have the best time of your life since... Wait nevermind this game was released in 2012 and I totally missed it until now.
NSMBU (Deluxe in my experience) is the final and ultimate game in the New series that involves Super Mario. Somewhat of a spiritual sequel to the Wii game, they went all out with new features like funny little baby Yoshis, an interconnected map, and dazzling new level themes like uh... Rock. The game plays pretty much exactly like Wii with tight controls, and that's not a problem because if it's not broken, why fix it?
U's level design is that of which has been seen many times before in Mario games following Super Mario Galaxy 2: Each level has some sort of main mechanic that is frequently reiterated throughout the level in new and varied ways, whether it be climbing up a growing beanstalk, balancing on seesaw platforms, or riding a terrifying skeleton roller coaster. These are some of the more memorable examples of levels in the game. It's very rare you'll find a level that you'd consider bad, but an exceptionally good level is also rare, the level of quality remains consistent to a predictable degree.
NSMBU takes a lot of pages from Super Mario World itself as well, including funny one-off enemies that only get one level designed around them as well as various secret exits within the map that take you to later worlds. However unlike SMW it's not marked which levels have secret exits and it's a bit frustrating trying to find them only based on context clues from the world map. Most elements of this game are in fact bits and pieces from previous Mario games, and most of the time you'll know what to expect the first few seconds after entering a level. It doesn't make for insanely engaging gameplay but it's fun to pick it up and play a few levels at a time, especially on something as easily portable as Switch.
In terms of new abilities U contains the flying squirrel suit, which works a bit like the propeller in Wii but it can be a little difficult to control where you fly. There's also the baby Yoshis which can be found all over the world map and in levels, carrying these around lets you do many fun and helpful things such as fly or shoot bubbles. They're closer to the SMW equivalent of Yoshi himself, since in this game adult Yoshi can not be taken out of levels he's already in. Having to hold the run button to carry the babies all the time gets a little annoying though.
Graphically this game kind of sucks in comparison to any other Mario game that came after it but it was Nintendo's first HD outing even if it really just looks like an upscaled version of Wii. Fortunately having such a simple style allows the game to use many assets quickly and easily such as various one-level gimmicks described above. Music-wise it's alright and if you're holding a baby Yoshi they will sing along to any background music in a level and it's funny.
The Switch version of this game contains a couple of new features: One being that Toadette is now playable, who can get a powerup to become a Peachy version of herself who can float through the air. She's got style, but she's effectively an easy mode despite the game already letting you play as Nabbit, who is an even easier mode. So I guess she's like a middle ground or something??? Needless to say I didn't use it because while the game can get fairly challenging towards the end, it's not the hardest platformer you'll play in your life.
Overall NSMBU solidifies itself as possibly the best entry in the NSMB series. Everything is a tried and true part of the Mario formula but it all comes together cohesively as part of a good package. Yes there aren't too many surprises but with all due respect I think people do dunk on NSMB too much simply for not being the best ever like Super Mario Galaxy or something. If you don't mind a platformer that's easy to jump into then hop on the flagpole and yell THREAT NEUTRALIZED except he doesn't say that in this game.