Nintendo hardware is cheap ass and has been for awhile now. They're not alone in this (hello awful, flimsy PS3 controllers), but I've had the last three portable systems from Nintendo (starting with the DS Lite) repaired due to quality issues. My DS Lite had the classic hinge crack. My 3DS scratched its own screen, and one of the shoulder buttons stopped working. And my Switch had drifting joycons, bezel scratching from the dock, cracking around the power button, flimsy joycon rails, a hot white pixel, and so on.
By extension, I also thought the Wii U controller felt flimsy and cheap and hell. But I put that down to manufacturing parts, going for something easier to replace and can absorb shock on impact.
I think the Wii was the last Nintendo hardware that felt really solid to me. I attribute that largely to the very simple manufacturing proportions of the Wii Remote and peripherals, but I never had an issue with the base unit or any of the controllers. Everything felt decently solid and sturdy.