I've been playing Super Mario rom hacks for awhile now. One of the big advantages of Mario Maker is that there is no frustration on getting the correct version of the hack and the rom for patching. Also, typically hackers have a certain way of designing levels so a SMW hack with 70 levels, most of the levels will feel 90% the same. Here you play the 10 course challenge and they will be from a different maker, and each course could be from 5 different popular Mario games. It's way more convenient to play levels here, than downloading rom-hacks, which many times have little or no review, bad headers, checksums, etc. (I once downloaded a Mario game that required 2 separate programs to be installed first, plus 500mb of free space and the physics were all wrong).
The game is 5 years old I'm sure everyone knows that. Although, Nintendo is strict there is no unofficial release of Mario Maker freeware like MegaMaker or Zelda Classic Launcher.