It might resemble New Super Mario Brothers, but this game is a lot more fun in my opinion. I just defeated Bowser and I'm up to the secret world, and I had a heck of a time playing this game. I might make a walkthrough for it because I really can't be bothered with anything else. It was truely a magnificent thing to play, especially World 7. I really enjoyed that world.
CONTAINS LEVEL AND GAMEPLAY SPOILERS
I have a few complaints here and there, such as how during some battles, like Kamek's and Iggy's, you can fall off the stage after beating them. Problem is, movement is disabled when you deal the final blow, so you're screwed if you have a bad jump path. I also agree with Internoob, some coins are an absolute pain to get if you don't have cooperative players with you to jump and press A, so it was annoying when getting coins like, say, World 8's airship, at the end where the coin appeared UNDERNEATH the platform, meaning you had to throw something at it or have the propellor hat, both which were hard to obtain. I had to sacrafice my ice flower so I could freeze a mechabowser to throw at it. The desert levels were extremely annoying as well, but they weren't as bad as the darkness levels, particularly 8-4, which was basically completely dark, and you could easily get hit by fish since they didn't appear at all in the shadows. The final part of the level was a nuisance too, since I kept getting pushed by the water into jellyfish.
As for music ... there was some songs here and there that got stuck in your head, but by far, Giga Bowser's final battle music was the best
in my opinion.