I remember the Nomad! It was awesome. :D I still have mine. The only bad thing about it was that the battery drained insanely fast, which was a problem because the system required a lot of HUGE, pricey batteries. It was (obviously) an underrated concept though.
Someone here mentioned the Super Game Boy. That's a good point, but hardly comparable. The starting premise of the Super Game Boy wasn't to make proper console games (Super NES titles) portable, but to make handheld titles (Game Boy games) playable on your TV, which is the reverse premise of the Switch. The Nomad was a more directly valid comparison to the Switch, as it used Genesis titles. See what I'm saying?