I find that the unsuccessful [1] consoles are generally pretty bad. The 3DO and the Jaguar and CD-i are mostly pretty crappy, and while it can be fun to play for a novelty and you might even find one or two games that make it worth it, the vast majority of the time there's a reason that people don't seriously revisit these consoles. To be clear, I did grow up with a 3DO and Jaguar (well, I got both when I was thirteen), so I'm not speaking out of my ass here.
So I was actually very surprised that the TurboGrafx games were actually quite good. Like, I kept going through random games, and I was shocked to find that a lot of them were actually very well made; decent graphics, tight controls, and fun gameplay.
There are terrible games on there, but I was kind of shocked to find that they appear to be outliers.
Now I kind of wish I had grown up with the Turbografx.
[1] A relative term, I acknowledge