Yea it was great. Why did they not included one in SSB4? :S
Cuz the Wii U didn't sell well and they clearly felt it wasn't worth all the time and resources to put it in there. At least that's my theory, and it certainly makes sense, would explain also why Mario Tennis on the Wii U was such a shallow experience while Mario Tennis Aces looks like its loaded with content despite being made by the same dev.