This has been bugging me this entire thread. Hol, it's not "Wii-U" it's just "Wii U", there is no hyphen. Also, yeah, the NSMB games are rehashes, but everything you have said is just ... wrong. NSMB Wii and NSMBU aren't really that similar at all, aside from the core mechanics and being a NSMB game. There was no lag in the Wii version. The title that probably had the least though put into it was NSMB2, which was fun, but still probably the weakest link.
As for 3D Land, I was literally JUST talking about this on AIM a second ago. Today I decided to start a new file on it, seeing as I haven't touched the thing since I got the five stars on my file just a few weeks after it came out, and I must say it is way more boring than I remembered. I think my first play-through was basically inspired by it being a new game and wanting to see what all it had, and yeah I definitely enjoyed that it had a decent amount of unlockables, what with a whole second half of the game, and also an extra secret stage, but the game play itself is kind of terrible. The game was everything I always wanted, a 3D Mario game that played like a 2D game, but now I have kind of come to realize that it just doesn't work how I thought it would.
Firstly, the levels are ridiculously short, and after a while start feeling uninspired. They started recycling level designs entirely, and even a lot of the second half of the game were just the levels from the first half albeit a little "harder." The problem lies in the fact that, for one, controls feel clunky. A 3D game needs to have a free-camera, not having one just makes things more annoying than they should be, especially say on stages where you're on the airships being chased by that shadow Mario (why does he exist in this game with no other ties to Galaxy or Sunshine?) The enemy placement is just stupid. You see a goomba, you can either risk trying to jump on it, and possibly missing, or just ... I dunno, walk right beside it and ignore it ever existed? It didn't do enemy placement quite like the real 3D games, so it just feels like they are uselessly put in. At least in the 2D Mario games, enemies are actually in your PATH.
The game also feels surprisingly empty and "lonely." The idea was great, and it should have been better than what it was, but it really isn't quite the game I thought I remembered. Once I played it without all that "new game feel" on it, I kind of realized that it is rather boring, unfortunately.