Disclaimer:
I'm not gonna focus too much on the hardware. Nintendo hasn't really cared about having amazing specs for a long time, and the fanbase has never been bothered by this fact either. I'm also not gonna focus too much on the price of the actual console, as I think it's pretty fair. Among Nintendo consoles throughout history, only the Gamecube has been significantly cheaper if you adjust for inflation.
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What I like:
1. Three different game modes
Stationary, tabletop and handheld? Say what you want: this is revolutionary! I always dreamt about these possibilities, and now someone finally delivers. Thanks Nintendo!
2. FIFA(!) and other third-party games
My console philosophy has always been the following: if Nintendo had FIFA and GTA, then the console war would be a complete walk-over from my point of view. Now I actually get one of the two, and the most important one at that! This effectively kills the Playstation for me. GTA and great specs aren't enough to beat Nintendo's exclusives and FIFA. Not to mention: I can play these games in handheld mode! Sayonara, Sony.
3. Good default battery
3 hour handheld playtime on a heavy game like BOTW is way better than expected.
4. The Joy-Con
Not only is the concept smart, but it effectively provides you with two controllers in one. Brilliant.
5. Region free games
At.fecking.last! It's always annoyed me how games are region-locked. It's nice to see a big console break away from this. This seems very unlike Nintendo, so it's a very positive surprise.
6. Cartridges
This is may sound stupid, but I've missed cartridges. I just like them more than discs, somehow..
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What I DON'T like:
1. Paying for online
This is pretty much the only big criticism I have, but boy is it a big one! I know that it's a business and all that, but it still pisses me off. This is even worse than the trend of adding a million DLCs to a game. I hate this idea so much, that I might consider not buying the console despite all the great stuff I wrote above.
2. Needlessly expensive pro controller
Another thing I've always hated(and this applies to all consoles), is that a second controller is not included when you buy the console. But it's always been like this and it's not gonna change, so fair enough. Having said that though: why make the controller cost 70 fecking USD? That's almost 25% of the price of the whole console, just for an extra controller. Greedy bastards!
3. The good games are generally still far away
BOTW, while not exclusive for the Switch, looks incredible. But apart from that, it seems that all the most popular/interesting games are relatively far away from being launched. You risk being stuck with just one good game for nearly a year(at least based on the info we've gotten so far). That's not good enough.
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What I still WANT to see:
1. A good virtual console for Gamecube
I love that Nintendo respects nostalgia and has a virtual console. But based on their job on the Wii U, there's a lot of room for improvement. It's rumored that they are working on a virtual console for Gamecube, so this will be their chance to redeem themselves. They need to do this well, because the most active and passionate fighting game community(Melee) has waited for this for nearly a decade now. Make it happen!
2. Good online connectivity
This has been an unnecessary weak point for too long. I can forgive outdated hardware and graphics. Lag and lack of effective multitasking while ingame though, is unforgiveable. It's about time they fixed it now. Especially seeing as we'll be paying extra for gaming online!
3. Support for old controllers(Wii U, Gamecube etc)
I love the Wii U pro controller and I want to keep using it, goddammit! I'll buy an adapter if necessary. Just make it happen!
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Overall:
I'm leaning way more towards 'positive' than 'negative', but the online thing is a massive blow. Had it not been for that, then I'd be extremely hyped. As of now, I'm just mildly excited. They're doing a lot of great things, but they're also making a couple of big mistakes.