Played some battle mode on the Gaf battle tourney side and...while it's kind of fun, the tracks are not modified or really designed to work with a battle mode at all
It could be utterly amazing if they could just provide some courses that are designed for the mode, but as is - you have to awkwardly drive around hoping someone doesn't green shell you while you try and turn the other way. Donut Plains is a pretty fun track to battle on thanks to the water sections tho. Just wish they had given that side of MK a little more love