I have bought every Nintendo console N64, GBC -> Wii, 3DS
3DS burned me because I bought in expectation of games I wanted and they didn't appear (classic Paper Mario, 2D Mario with some production value, 2D Metroid, Pokemon, Advance Wars)
So now I am holding off on Wii U until at least one of (Metroid =/= MP3/Other M, 3D Mario =/= Galaxy, Paper Mario, Smash Bros, Mario Kart, Zelda =/= OoT-SS) appear, in addition to NSMB U which while good I'm not paying $500 for.
If they produced a Wii U minus the tablet controller for $150 I'd consider as well.