real talk: don't buy this. Not even if you're loose with cash. There's potential but at this point (or until 2013, really) it has no redeeming qualities. Going back to the Wii via Wii Mode was a radical difference in usability. Things don't work, and those that do work slowly. It's unfinished. And not unfinished as in missing features like 3DS or Vita.
That said, parts of Nintendo Land are surprisingly fun. The Zelda mini-game is the best part of Wii Sports Resort with a cool cardboard/patchwork spin on Zelda themes. Metroid game is like Link's Crossbow Training. Fzero game is decent fun. There's a bunch of games and bunch of levels/models for each. It's better than Nintendo's other shovelware-y software like Wii Sports Resort and Pilotwings 3DS.
The shuriken throwing game is an example of why the resistive screen sucks for swiping motions. There's even a message that pops up to say "if you're having trouble, use the stylus!"
You're playing Nintendoland? Alone?

Mario is really good, better than the DS and 3DS ones definitely. Squirrel suit feels like a downgrade over the propeller suit but maybe I just need to adjust to it.
And again, can't be reiterated enough.

Buttons for picking things up and the mid-air twirl.

The overworld doesn't really add anything, but it makes the game feel a lot more "complete." If that makes sense.
Music is the trademark awfulness of the NSMB series but some tracks are decent at least, probably the best soundtrack of the New games even if that's not saying much.
Damn shame this doesn't have online. Seriously, it's an epic failure on Nintendo's part. Would definitely have gotten a LOT more buzz if it was online. Oh well.