I bought a Hitachi adapter powered 2GB HDD specifically for the Wii U. I thought, let's play it safe, buy a HDD with it's own power source so it has to work with the Wii U. Well it doesn't work at all. The system sees that there's a USB device connected, but it won't format it, so it's useless. The compatibility of HDDs seems to be hit or miss.
Adding credit to your account in the eShop is faulty. I tried adding 60 to my account to buy a game, but an error code told me that my 150 credit limit was reached. My credit amount was 0.
I have both a 3DS and a WiiU (which is quite common I guess..), they are both linked to the eShop with the same Club Nintendo account. There are credits on my 3DS eShop account, but I can't spend them on WiiU and vice versa. How user unfriendly is that?!
I wanted to buy Assassins Creed but when I pressed the 'buy now' button a message told me that this content could only be viewed at certain times and that it was unavailable right now. What the hell is up with that?!
When I was finally able to buy Assassins Creed in the eShop I started this massive 18GB download. But it's so damn slow, ocassionally stopping completely for minutes. It just won't continue, resetting the console also doesn't start things up again. It's not my wifi, because streaming 1080p youtube videos at the same time in the WiiU browser works perfectly fine. There has to be something wrong with Nintendo's servers. They are probably overloaded now or something. Or it might have something to do with my previous point.
Estimated time remaining indicator
While downloading anything, whether it's a system- or game update or a full game, you'll see the progress bar and an estimated time remaining. That time indicator is a complete joke, it goes up and down randomly and it is NEVER correct. Why display it if it's completely useless?!
The WiiU's operating system is slow, changing from the WiiU menu to Miiverse, eShop, browser etc. is all very slow and clunky. The apps work great, but changing between them takes too much time.
Adjusting screen size
The corners of the WiiU interface fell off my Samsung tv, so I wanted to adjust that. Turns out that those settings weren't in the main system settings. No they were hiding somewhere in the eShop settings of all places. When I need to adjust screen settings, the eShop is not something that comes to mind to do that. What UI retard came up with that logic?!
Your downloaded games are tied to your user account AND your physical console. If your WiiU for whatever reason breaks and you buy a new one, you can't automatically redownload the games you've already bought. You have to call Nintendo and do who knows what to fix everything again. Nintendo's DRM is completely user unfriendly and outdated.