view it in a positive light

those investors probably had to get rid of some stock to have enough real money to buy Switch + games + peripherals day 1 ;)

Bravo Bravo!

They are selling to cash in in the peak hype before the reveal. Means nothing. The console looks cool. It will outsell the WiiU for sure.
If they have a good relationship with 3rd party, this could be a winner...

Stocks always drop whenever something new happens with any company. The market does not like change.

Buy the stock when you think it won't go any lower and reap the benefits in a few days.

They didn't show anything that will sell the machine outside Japan really

Not surprised. There is nothing about the switch that is terribly different from the Wii U.

Doesn't mean anything at all.

$299 for the specs on offer AND paid on-line multiplayer... OUCH.
Seriously, this hits them on both casuals AND "2nd console" types.

I mean, imagine every mom buying a console for kid, who doesn't care about performance herself,
now there is zero price difference up-front and ongoing to PS4/Xbone which have bigger brands
Nintendo is expecting the same dedication (paid online) as consoles offering full spectrum gaming.
They've lost it, they ignored the fact they are not Sony/MS, and yet think they can act the same way.
They can't use modern 14nm fab for at least tablet-competitive performance, yet still can't manage a cheap price for it all.
After this, they are going 3rd party, that's it...

Yeah, now no one at the stock markets will buy a Switch and we all know that's the most important demographic.

Like everyone else, investors were expecting another Wii. Also the content probllems are still pretty obvious.