I'm a pretty big Nintendo fan, have always enjoyed their consoles and first party titles. But I find the hardware, UI and app distribution quite poor. Maybe it's from being spoiled by high quality hardware from apple, but the low resolution resistive touch screens on my 3DS and Wii U Gamepad feel terrible to use.
Because it's a touchscreen designed for a different purpose. All Nintendo touchscreen devices ship with a stylus because, low and behold, most of gaming involves precise inputs.
Low resolution= longer battery life, cheaper production costs, cheaper dev costs.. since higher resolutions mean higher res assets, smaller file sizes. Have you used a Vita before? It's heavy and the battery life is dire. And importantly it failed compared to the 3DS. (unfortunately, I love my Vita!)
The UI seems so messy on the consoles. Honestly I'd love to see a very simple and clean looking thing like the Apple TV, with having a list of games and just choosing something to play.
If an interface is more important to you than games, buy the device with a nicer interface? The Wii U's interface is functional, and like I said before it's clear who Apple took lots of inspiration from when making their mobile interface.
Software/distribution: Purchasing apps digitally (games really) is an absolutely terrible experience. I've had some I purchased online and had to redeem on the console. I can't believe what kind of process it is, entering IDs, passwords, unique codes from the purchase, etc. All of it for the purchase to be then tied/connected to the single piece of hardware and not my Nintendo ID. We have a Wii and a Wii U in the house. have you ever seen the process to transfer digital games from one console to the other? I can't imagine what it would be like if the Wii stopped working and I had no way to get games off. This is where it feels Apple really excels - purchase a piece of media, app, game, whatever, it's then tied to your account and you can access it anywhere.
You either buy games from a site, you get a code and redeem it on the shop menu (same as iOS), you don't even need to enter your password if you redeem a code.
or
You buy the game from the eShop (appstore), you enter your password (like on the appstore) and it asks if you want download it now or whilst the console is sleeping. All your previously purchased items are listed on the eShop app too (like on the appstore).
What's different about it?
No, games are now tied to your Nintendo ID. They have been for a couple of years, previously they were hardware-tied but you could get them back by contacting Nintendo.
Don't get me wrong, I love Nintendo, I just feel like Apple could excel at building the ecosystem and platform, and let Nintendo do what it does best, first party titles (and some excellent bluetooth game controllers).
So let me ask you for maybe the 3rd time now.
Nintendo sold 26m copies of a full priced game, on a platform that they also make a profit on per sale. Given this, why would they "merge" with Apple?