Well the fixed the one thing that has been wrong with them for the past decade. The controls being a damn gimmick. There's no multi screens and no motion control, just buttons. The Joy-Cons gimmicky, but only in a functionality way in how it separates and can be used in various methods. The most important thing is that there are buttons to use, and 1 screen. 3rd party developers don't want to put in the extra work. I expect mostly ports from them, and its important that they can port games from XB1/PS4. Sure there will be some exclusives here and there, but cross platform titles is what Nintendo has been lacking for years becasue of how extremely different their console was. They finally found a way to be innovative without screwing around with how a game works.
If they put a killer price like $299 I'd pick one up for Breath of the Wild and the new Mario. Honestly this is Nintendo's best idea in years. If something like this came out a decade ago, I would have used it mobility feature a lot bringing it over to friends houses to play smash bros. Hell a real Goldeneye remake would be sweet in that situation. Have a faux lan-party with a few friends on multiplayer.