Not sure why he couldn't beat that 10 sec course. I played it and beat it first try

Great video footage!  ;)

I gave this a go at one of those Best Buy demos.  It was a lot of fun.  One thing that really makes it stand out is the retro-style graphics.  They have no much more personality than the NSMB style graphics.  I see one of those games I think "meh" but this begs me to play it.  Maybe it's nostalgia playing a role but it really just seems more interesting.  I played one NSMB style level and it just looked so lifeless in comparison.  Of course the SMB style appeared only twice and the SMB3 and SMW only appeared once each.  The NSMB is a standard that gets trotted out game after game.  In the old days each Mario (except Lost Levels) was so visually distinct you could identify each game instantly.  Just little things like seeing a character from a later game rendering in an older style attracts your interest.  And then they throw in weird stuff like references from other Nintendo IPs and it just has this goofy anarchy that's completely absent from the "safe" NSMB games.

I wonder if Nintendo realizes how unnecessary new NSMB games are now that we have a Mario game where new levels can be created in perpetuity.  Any new Mario 2D sidescroller has to demonstrate some uniqueness to stand out.  If it's as generic as the NSMB games tend to be, why bother?  Why not just fool around with this instead and download levels from others?  New NSMB games will need to demonstrate features that cannot be done with Mario Maker.  Hell, in the future we might see player-made knock offs of levels from other Mario games.  Why buy the new Mario game is someone is offering recreations of every level in Mario Maker for free?  The new game has to be different enough that that can't be done.