Look at Wii's launch and early 2007 1st party lineup in Japan and compare it to the shitshow we have here.
It's definitely better, but not really too far better in terms of the actual content imo. Wii really benefitted from a much easier generational transition, essentially being an overclocked Gamecube. Pretty much all it's early "deeper" titles (Zelda, FE, SPM, etc) were clear GCN games originally with pointer or waggle tacked on and the original motion developed titles were a lot simpler than Nintendo Land. Had all the intended "launch window" titles made it (Lego City, Wii Fit U, Pikmin 3, W101, Panorama View, possibly Rayman Legends) I think Wii U definitely would've had the edge.
Wii Q4 2006 + Q1 2007
12.02.06 The Legend of Zelda: Twilight Princess (EAD)
12.02.06 Wario Ware: Smooth Moves (SPD/Intelligent Systems)
12.02.06 Wii Play (EAD)
12.02.06 Wii Sports (EAD)
12.14.06 Pokémon Battle Revolution (Genius Sonority)
01.18.07 Excite Truck (Monster Games)
02.22.07 Fire Emblem: Radiant Dawn (Intelligent Systems)
03.08.07 Eyeshield 21: Field Saikyou no Senshi Tachi (Eighting)
Wii U Q4 2012 + Q1 2013
12.08.12 New Super Mario Bros. U (EAD)
12.08.12 Nintendo Land (EAD)
12.08.12 Nintendo X Joysound: Wii Karaoke U (NdCube/Tose)
02.07.13 Wii Street U (Google)
03.28.13 Game & Wario (SPD/Intelligent Systems)