The online problems with this game actually go even deeper than I thought. This is from the IGN review. They gave the game a 9.0.
http://www.ign.com/articles/2014/05/15/mario-kart-8-review
http://www.ign.com/articles/2014/05/15/mario-kart-8-review
Online mode supports up to 12-players, and Nintendo gets a lot of mileage out of Mario Kart 8’s basic online features. It’s easy to join races, setup tournaments, and even upload highlight videos to YouTube, but once again, Nintendo’s den mother attitude rears its head: Chat is restricted to lobbies with friends only. There’s no option to invite friends into a game, and Mario Kart 8 also doesn't provide message notifications. This is seriously disappointing because you have to use outside means to coordinate friends-only races. These omissions often make Mario Kart 8 feel like a fancy import Ferrari with an old ham radio built into the dashboard.