If that truly ends up being the case then Nintendo will have a huge problem on their hands in terms of making this thing sellable to newcomers.  No company wants that kind of learning curve for any of their products.

Think of it like having to work out how to swing properly in Wii Sports Golf. That took a learning curve, yet did not detract from the appeal of the game overall. The problem of combining tilt controls with 3D is different, i'll grant, because it spans multiple games, but is similar in nature. This is part of the reason the analogue 3D slider is there in the first place, because they realized that different levels would be needed for different scenarios for different people.

Besides that one fault you mention, Wii Sports games were all fun instantaneously within minutes - the experience was intuitive.  If it was a bit awkward you could adjust and it could even be within the same play session that you fix whatever miscalcualtions there were.

This sweetspot is not intuitive and is actually not fun at all when it doesn't work (double vision).  Wii Sports games were all fun because it was simply fun to do the intuitive gestures and recieve some level of meaningful feedback (the sweetspot is a bit black and white one could say).  I am very eager to see how people react to the 3DS compared to the initial Wii reaction.

When you first start out the experience is highly rewarding when it works but is unusual and inconsistent.  As you aclimatize to the new technology, its precision and consistency ramp up to meet your increasing comfort level and skills.

Its a fairly similar situation from my point of view.

Yes, having to adjust the position at start and then on the fly when you play with 3D and motion control together is neither part of the game nor of the fun. The fun thing could be for third people, though: if it's true that a partial solution is tilting the head while tilting the portable, after a while we could start to be able to spot 3DS hardcore users immediately thanks to the bull necks they'll develop.   

I saw popout in Zelda. When running around the Kokiri Forest the lights floating around cam out of the screen.

Its true that its rare, and imo this is a good thing, due to it making the 3D too obvious, and almost a distraction from the onscreen action.

They're only built up to a certain scale in the mobile phones which use them. Nintendo had to make a choice between price, battery life and graphical capabilty. I don't see anyone complaining about the graphical output, but I do see complaints about battery life, and NOW you think a bigger screen would have been smarter?

no

From a review of a 15 inch Sharp Actius Laptop, with Parallax Barrier screen -

"However, three 3-D–enabled Electronic Arts games bundled with our test unit were problematic. On Need for Speed Hot Pursuit 2, we observed vertical bands and ghosting (secondary images); on James Bond 007: Nightfire, the ghosting was severe, and each eye saw not one but two aiming circles, making it hard to rack up a decent kill rate.

Also, because you're looking at the screen's flat 2-D surface, there's an acclimatization period while your brain figures out how to process the image. Indeed, some of our viewers complained of eyestrain. Adaptation can be instantaneous in teenagers, Sharp says, while older users (60 and up) could take a couple hours to be comfortable."

http://www.pcmag.com/article2/0,2817,1386949,00.asp

I would imagine that any loss of resolution between 2D and 3D mode on a larger screen would ultimately amplify these types of  issues.

I played it today and I must say it was really great. The Games (Pilot Wings) played well, and the graphics looked good, and i had fun playing and seeing the 3D, so yeah I'm happy with my purchase (I preordered it)

Also i had no double vision, even when i went to the side, if i waited for a second and let my eyes adjust it just went flat, not pop out, maybe i'm weird, but i liked everything about the device

Only Pachter has the skills and authority to decide these issues, we need his help!

Not really. Despite hurting my eyes much worse than any 3D movie (they don't hurt my eyes at all, I just need to adjust them a bit), I did notice some depth. It's not real 3D, but stereostopic and it was noticable in some of the AR games. I'm sure some of the games that release for it will actually use it properly.

As far as interest, I wanted to play some of the games that were announced (Professor Layton), but I'm certainly not going to be in any hurry to buy one. I waited several years before getting a DS (I got a DSi for myself not long after they released) and the 3DS is far less compelling imo.