Big Mac for Mouth made me chuckle, but when it comes to video games, some people are quote unquote "morons". Especially with Nintendo in that parents are the ones often making the purchasing decision. If you're a hardcore player, sure you know all this stuff and it doesn't have to be explained to you.
But if you're a 50 year old mom who last played video games in any extended fashion with Pac-Man in 1981, well yeah you might be confused as to what a Wii U is versus a Wii and what a 3DS is versus a DS or which Smash Brothers your kid wants.
Also to be honest I think SMB2 Japan wasn't released in North America because NOA (and IMO rightly so) saw that it was basically just a rehash of SMB1. There are plenty of NES games from Nintendo that are harder than SMB2 Japan.
And the level skip feature isn't all that bad either IMO ... yes the point of the game is to play the levels, but say you are a novice gamer and simply can't beat one of the levels. Should you not be able to play the rest of the game because of that? To be honest this has happened to me in the new DK: Tropical Freeze game, which is fairly freaking hard. I reached one of the bosses and it's just too much of a headache to beat him so I've never finished the game. Maybe I'll go back to it later, but maybe not.
Besides is Super Smash Bros. for Wii U really that different from Super Smash Bros. U? You can call it the latter if you want.