Which Wii U game has the best online multiplayer in your opinion, and why?

Splatoon could have been the best, if not for the problem of japanese servers, and that awful rotation of of maps and modes...

Pokken because of the amazing matchmaking, rank system and no laggy matches (most of the time).

As for shooter, Splatoon and Black Ops II. so much fun with those two!
For the rest, Super Smash Bros U, Mario Kart 8, and well... Mario Maker is online too. Whoops, Online multiplayer! So, no Mario Maker. Well, another fun game is Splinter cell, even if the multiplayer is not even close with the campain...

So, here my TOP 5 multiplayer online:

#1 Splatoon
#2 Super Smash Bros U
#3 Black Ops II
#4 Mario Kart 8
#5 Splinter cell

I talk about multiplayer only, not the overall game of course. 

Mario Kart 8 because its the only WiiU game Ive played online...

Mario Kart 8, Splatoon, and Smash all have their fair share of problems in the online capacity. In terms of problems, MK8 has the least apparent of them, but I'll say Splatoon because it's the most fun to play, simply.

Pokkén Tournament is gonna take that spot, i'm amazed it's the only title in Wii U that actually has a fast match making and i have yet to find a laggy match.

Smash bros, simply amazing, and fun

Splatoon for me.

Mario kart-

never had lag issues in game. Hackers are way down compared to MK for Wii. Only thing I don't understand is place selection. Why did they make it where you could only pick 3 selected places or random? Quite strange.