The biggest issue was that all the marketing was built around the tablet. It was very rare you saw the console or that it was prominent in shots. It didn't help that it looked and felt like some Fisher Price toy and that its games felt like Wii ports. I was impressed by Zombi, but there was a big feeling of "What now?" on day one.
Was also stung by the Vita at around the same time, which was the bigger disappointment. At least that had potential.
The Series X sales are down to scalpers using bots, most likely. 700 per cent rise isn't that big a jump when there are barely any One X consoles to buy either.