At the end it was exactly what we all thought it was going to be. Design wise it's beautiful, as for the rest I'm skeptical. People are already talking about "home console graphics on handheld" when it's more likely to be "handheld graphics on home console" for a good number of reasons, unless there's magic somewhere. With PS4 Pro and Scorpio, I wonder if that will be enough for some gamers.
The size is what worries me most. How many people are going to play home console designed games on the go, on a screen that's too small to fully appreciate the experience and at the same time too big to carry around, when people already have smartphones of 5"-6", tablets / surface / whatever in the bag. I mean, I'd love to play Mario Kart split screen outisde but not on a screen the size of my hand.
These downsides could quicly make Switch become a weak home console, mostly, and a handheld, rarely. It feels more like a long range Wii U.. but it could be a fake problem.
The greatest thing about it, indeed, is the unified library. That's gold for every Nintendo gamer and a good strategy for Nintendo. There's a good chance for success, in my opinion.