I mean, it is 1000x better than Brawl wifi and it got delayed twice D:<
1) 12 player races with no lag at all.
2) You connect with up to 12 other people in literally like 5 seconds.
3) While you wait for the next game, you can watch and scout out the skill levels of the people you are about to play.
4) The ranking system is very fair. It doesn't tell anyone your record, but you win points according to your current point count, your opponent's point counts, and most importantly, where you placed in the race.
5) You can race the world record ghosts. You can even race random people's ghosts, and you can send time trial challenges by sending your ghost to your friends(which I have had an absolute blast with)
6) You can join your friends in the race they're currently in, and you can see what all of your friends are doing.
Great job Nintendo

I hope you other titles are like this!