Nice!
I posted a meme Tweet about this, but a more serious answer here.
I think overall VL1 is the worst track, but for GP & 2P it's not the most boring one, that honor just has to go to MC4.
NBT TTs (PAL/NTSC combined...per system the tier list would be a bit different):
GP150cc (speedrunning NTSC version):
2P action (PAL CDM):
BM: