But it was apparent to us even before the system launched. Plenty of time for Nintendo to add a 3DS gameslot under the flap on the Wii U.
I'm baffled every time I see this suggested. If this was anyone's expectation, consider reevaluating reality. First, Nintendo either raises the price of Wii U (which some people already balked at) or they essentially give a 3DS away for free. Why would anyone think Nintendo would do that? Second, enabling this functionality is likely a lot more work for Nintendo than people think it is. I'm not exactly sure what the payoff is for Nintendo. They want to sell two systems, not hurt 3DS sales to increase Wii U sales.
Nintendo's problem is that they didn't do a good job of communicating the value of Wii U. While I thoroughly enjoy my Wii U, I can admit that. It serves my purposes as someone who doesn't play a lot of video games. For everyone else, it's unacceptably inadequate. Even if one could play 3DS games via Wii U, the Wii U part of the console would still be lacking. A console should be able to stand on its own merits, not on the shoulders of another. If Nintendo ever wanted to introduce a 3DS Player, I would understand that more though I'm still convinced 3DS games would be significantly worse played on a TV/GamePad combo.
I'm not actually suggesting that Nintendo should have added a 3DS player the Wii U out of the gate, I'm was more venting that there are plenty ways to add value to the Wii U and Nintendo didn't really pursue any of them. Money was left on the table as they took the "good enough" approach once again. They banked so hard that we would all be blown away by a "tablet" controller that can operate like a handheld on your couch that they forgot to add or plan for a few things that seemed quite obvious to the rest of us.
-Like multi-touch. May not be a necessity, but it would certainly make certain things more intuitive when using a touch screen.
-Second game pad support. Nintendo didn't even consider the idea add it was one if the first things that everyone kinda got excited about.
-The Wii U could be a 3DS player and the Wii U already looks like a Wii, so maybe they should make a small side flap with an expansion port for a future accessory.
-Game pad remote for tv and cable is good and Nintendo thought it was "great" but it could have been so much more, same with the TVii service, it just didn't take the execution of the idea far enough, lots of room for completion to come in and trump you.
-multi tasking built in features like video chat & internet surfing while playing games our watching videos, or playing simple games the game pad while watching videos on the TV.
There are plenty of other examples of Nintendo picking the fruit long before it was ripe, and I'm sure that's a big reason the sour taste in a lot peoples mouths. The system just didn't turn out to be what most if is hoped it would, and on top of that it was slow, and Nintendo was being even slower to fix it. The system is half baked, poorly marketed & under supported.
A relaunch with a new design would be a good place to start. some software value adding could help (better remote app, upgrade TVii, support and advertise the VC, more entertainment apps, better bundles, eShop credit, unified accounts & a 3DS channel for demos and downloaded games), maybe even adding that 3DS card slot under the flap and pushing 3DS connectivity would garner some much needed attention.