It also explains why Mighty No. 9 was delayed by saying that the core gameplay of the game is fine but the online part of the game still has bugs and issues that need further time to polish. (gearnuke.com)
I got to try it many times at my cousins house and the online part of the game is horrible. (nintendotoday.com)
Secondly — I've not managed to connect to the online part of the game. (thesixthaxis.com)