Whelp,
Nintendo did it.
They screwed up SNES Rainbow Road somehow.
They ruined the Music's whimsical tone,
They made the background tell you "Hey, we're only like 5 meters above ground, who needs Space",
They made the Super Whomps bigger,
They made the waving road act like a bunch of freaking Tidal Waves instead of being Trick-able ground,
And they made most of the road next-to-impossible to drive on (specifically in the split path section, if you're on the road with the incoming Super Whomp then you're forced to either fall off or get hit).
YOU HAD ONE JOB, NINTENDO.
ONE JOB.