You can't judge the majority reaction from forums like those. I think Nintendo and Wii U will be just fine in the long run.
Anyway, as for my initial verdict:
Wii U system itself - Didn't like the long ass update you have to do right away, but otherwise, the system itself is really cool and shows an awful lot of promise.
Nintendo Land - Bright, colorful, good looking. Cool music and retro graphic touches here and there. Otherwise? I wouldn't have paid for it by itself. Not because it's a minigame collection. But because it's nowhere near close to Wii Sports, which every single game in that was at least OK, if not great. This, on the other hand? Meh. Not bad. Just meh, to me. Glad it was a pack in.
New Super Mario Bros. U - So far? Fantastic. There are things I already see that I liked better about NSMBWii, such as the nice item inventory style menu, which this is lacking, as well as the cool card game for item Toad Houses. And naturally, it seems as if NSMBWii had the cooler power ups (Propeller, Penguin Suit). But the graphics are awesome, of course, and the game overall is very cool so far. Well worth the money.
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