My track reviews for the hell of it:
Mute City: Looks gorgeous and has a fantastic sense of speed throughout, with almost non-stop boosting and permanent anti-gravity. The shortcut at the end is great fun to pull off, even if - as with most MK8 shortcuts - it doesn't actually save much time. 9/10
Yoshi Circuit: The best non-Baby Park track from the mostly terrible Double Dash!!, it's easy to see why Yoshi has been brought back for a third time. It's a fantastic track for pure racing skill, with a really useful shortcut (shame the second one was cut, again) and an inspired idea for a layout. Not sure why the helicopter isn't Yoshi anymore, though. 8/10
Excitebike Arena: The most straightforward track layout in the game produces, arguably, one of the most enjoyable races. It's havoc from start to finish, with lengthy straights turning green shells into long-range torpedos. The variable track elements mix things up a little, though their effect isn't particularly noticeable once you get going. 8/10
Dragon Driftway: Probably the twistiest, loopiest track in the game, making it all the more important to know your racing line before heading in. Mistiming a powerslide can be deadly here, with several sharp corners seemingly designed to punish imprecision. Might wear out its welcome eventually, but an enjoyably challenging track. 8/10
Ice Ice Outpost: On the face of it, this is a pretty unambitious track, but swapping between lanes is more fun than it has any right to be, the shortcuts are fun and it feels chaotic in the enjoyable way. Very solid. 7/10
Hyrule Circuit: Enjoyable, but nothing special. The attention to detail is the best part of this track, though considering the rich history of the series which inspired it, it feels rather bland. Good 'puzzle' shortcut, but in racing terms, there's not much else of note. 6/10
Wario Goldmine: Improved over the Wii version, though I'm not sure how or why considering how few changes have been made. Gone from being a bit of a bore to a solid little circuit, the new anti-grav section is a positive change, but that's about it. 5/10
SNES Rainbow Road: Cards on the table, I've rarely enjoyed remakes of the SNES tracks (Donut Plains 3 being one of the better ones) and this feels no different. It's pretty boring to race on, the least visually interesting of the game's now trio of Rainbow Roads, and feels very much like a design from an era with major limits on what was possible. 4/10