A good polytrack track has nice flow where corners lead into each other smoothly and you don’t lose all your speed for no reason. The theme matters too, like if it’s a jungle or city it should feel like that all the way through, not just random stuff thrown in. It should have some cool stuff like jumps or tunnels but not too much or it gets messy. Also you should be able to see where you're going, no blind corners or annoying camera stuff. and it should feel fair, like skill matters and you're not just getting wrecked by the track being weird. Speed should be kinda consistent; in my opinion slower tracks are better than fast ones. No z-fighting. No quick speed losses. The track is possible starting from every checkpoint etc