On our forum, gamers claim if it sells 20-30M copies, that's good. No, that's a disaster!!! Since this 1 console is supposed to replace DS/3DS/New 3DS and NES/SNES/N64/GameCube product lines. That means it really needs to sell at least 80M units [just to match 3DS portable and the GameCube home console sales]. For some reason, people are ignoring this point. One cannot claim that the Switch is a portable + a home console, but then ignore that its combined sales then should somewhat make up for Nintendo's portable and home console system sales of past generations. If this console sells just 20-30M, that's a bigger failure than the Wii U since it was meant that to replace 2 console segments.
To be clear, I don't think them selling half what the 3DS sold is a good thing. I was just making the point that the Xbox One set a low bar so far for console sales. The Switch needs to sell over 70 million to really be considered a success which might be a tall order.
I am personally very excited about the Switch though. I am not a hardcore Nintendo fanboy (don't own the 3DS or Wii U), and in a way Nintendo rewarded me for that lack of loyalty by giving the Switch a better version of Zelda, a much better version of Mario Kart 8 (online battle mode is huge), a better version of Splatoon and what will be the most anticipated Mario game in a long time. I feel bad for Wii U users who are watching their console prop up the next one, but frankly it worked for the Wii.
I am also personally really excited that two good looking JRPGs are set to come out for the console. That is my favorite game genre of all time which has been regulated to a few 3DS games, a few Steam indie games of questionable quality, a few Squaresoft smartphone respins, and little else. Hell Square is taking the holy temple of the JRPG- FF7- and is ripping out the turn based guts in the PS4 remake. That took that title from something I would buy a PS4 for and turned it into a title that outright offends me. The Switch is basically my last hope to play a new decent JRPG on my tv. I preordered Xenoblade 2 already.
I am also excited to play on the road the kind of games that have filled up my Steam library (Rayman Legends for example) but I don't ever actually play because I don't want to fight for tv time with my wife's desire to binge watch whatever crap the CW came out with recently for that kind of game. When I get TV time I want to play Doom not (admittedly highly rated) Rayman, but the standards for portable games are different. I will probably play the Switch in portable mode more than 50% of its active life and probably overlap a decent part of the unplayed part of my Steam account on it.
I am worried about battery life for sure, but the Switch having a USB C port helps there because I can easily get a cable to plug it into the half dozen battery packs I have to charge tablets and smartphones already. Honestly I am more worried that the demo Switch at the show didn't have a web browser. At the end of the day the Switch is a tablet (though a low PPI one) and it would suck if it couldn't browse this forum like any other tablet can just because Nintendo is scared of browser hacks or offending their new buddy Apple. I also don't like the accessory cost, but I say that as a guy who bought way too many $120 Wii controllers ($60 Wiimote, $40 Nunchuck, $20 Classic) back in the day. That isn't enough to push me away from the console, but is enough to get me to avoid buying a game like Arms that basically requires another $80 Joycon to play as intended with others. Given how Nintendo didn't even give New 3DS XL users a charging cable it could be worse. I will wait to get a pro controller for the next time one of those visa/PayPal/Amex/mobile/etc coupons come along. I am getting every game but Zelda and online only ones for less the asking price across the board thanks to Amazon giving out preorders for every game announced, that helps the value statement a ton.