"Confusing name, underpowered, inept user interface and a shortage of games – these were the names of the four horses of the Wii U's apocalypse."
The original Wii had a confusing name and was underpowered and had fewer games than its rivals.
Yet is was a huge success. There were a number of reasons for this. The first was innovation. The Wii controllers were truly revolutionary. Second was price. The Wii, on release was (IIRC) £170, far cheaper than its rivals. Third was that it appealed to a different demographic to its rivals. It was a family/party console.
The Wii-U was too expensive, on release it was £300 (for the 32GB version), and its killer feature (the Wii-pad, thingy) was a solution looking for a problem. For most people who owned a Wii (myself included), there was little point in upgrading.
Eventually I bought an XBox One, but still wheel out the Wii for party games. Wii Sports Resort still knocks the spots off the, frankly lamentable, Kinect Sports.