Well the fact that most of the rest of the presentation sucked didn't really help Nintendo's position. They announced one good thing (Paper Mario x Mario and Luigi) and they expanded on StarFox (which unfortunately didn't really seem all that great IMO). That's about all they did right (still have no idea why they left out the Fatal Frame trailer, which looked really nice). The fact that they announced games like Animal Crossing and Metroid got everyone hyped, and then Nintendo was like "lol no these are spinoffs guys, now buy our amiibos" was just...
I think they had the right idea with their 3DS Animal Crossing: Home Makeover Edition, but they undermined anything good they had there by announcing an Animal Crossing Board Game which nobody wanted in the first place (plus it's literally called "Amiibo Festival"). And then there was Metroid. Fans have been waiting since 2010 for a new FPS, and since 2004 for a new sidescroller (and that's being generous, counting Zero Mission as a new game). Teasing a Metroid game and then being like "lol nope" was possibly the worst thing they could've done. If that game had released without Metroid branding, I would never have bought it. Releasing it with Metroid branding is just insult to injury. It looks like an indie developer made it in 2011. And then to brand that as a Metroid game? Not a wise move.