I had a Majesco Game Gear. I thought it was a great buy, and the technology was by no means far behind the times in 2000, at least not in graphics, gameplay, or visuals. You had the Game Boy Color, which was on par with the Game Gear but not backlit, and a few other similar systems with the same problem. Even the first model GBA did not have that lit screen.
I picked up a bunch of Sonic and SNK fighting games for my Game Gear and loved it. Majesco rereleased "some" good games such as the Sonic games, and there were a few others like the Lion King. But second hand older releases were readily available.
Majesco also rereleased a few Genesis, and maybe some Super NES games IIRC. I have a sealed SFII CE that I purchased for $1 around 2002 or so. I "think" they made it. Now that was obsolete at the time.