I bought the bing bing wahoo 2 machine today, got the last mario cart bundle walmart had. I like the build quality, it physically feels better than my oled switch, the magnets hold pretty well. 1080p is a nice pixel density for a screen this size, makes mario kart look great even though there is motion blur an oled screen wouldn't have. If they do release an oled version I don't think I'll buy one, I find that I'm too autistic for oled and the idea of screen burn makes me not want to play certain games and keep the screen brightness down as low as I can stand for any given room brightness. I have yet to try out original switch games on it but the idea of better performance is nice, I wanted to go back to play some arceus one of these days anyway. Also I figured I'd get the first version for just in case it's easier to hack than later models like other consoles when it does eventually get hacked.
I'm not a huge mario kart fan and didn't play 8 much so I can't compare, but I'm having fun with mario kart world. I probably wouldn't pay $80 for it but since it's cheaper with the bundle and is the only big thing out for it right now I grabbed it. it'll be a good game to play with family anyway. People going on about how its garbage are probably being overdramatic. It's not a system seller for me, the real system seller is air riders.
tldr got what I expected I'd get, not disappointed. It'll be interesting to see how things pan out long term. I haven't seen much talk about it in my circles, so it doesn't seem to have made much of an impact on launch from where I stand.