In 1986, I saw some awesome arcade games at the time.  Games like Space Harrier and Out Run blew me away back then with their amazing 3Dgraphics and I started to become a SEGA fan.  Now out comes this new game system BY SEGA, a 8-bit machine released by the Toy company Irwin in 1987 that looked even better than the 8-bit Nintendo (at least on the screen shots).  I was VERY disappointed to find weak arcade translations of After Burner, Space Harrier, and many others which often bored quickly.  Sega (much like Atari) got hammered by new comer Nintendo and there NES game machine.

Sega did not give up though, it was cool to see a TWO-PLAYER Double Dragon (although it sucks) and a home version of R TYPE (which was released by Nintendo in the arcades, btw) plus we can't forget Phantasy Star, a four meg role playing game that killed any RPG (even Final Fantasy and Dragon Warrior for NES) for the old Nintendo.  Buy a Genesis, then the Master Converter for under 20bucks and avoid the Master system if you can.
Rating: 58/100 a good system if you can find the right games.

Rare Scale: 5/10 it can be hard to find a sega master system with the special 3Dglasses.

COOL SegaMS TOYS
3d glassics
The expensive black specs will only work with certain games like Maze Hunter 3D, Missile Defense 3D, and Out Run 3D but they add unique looking 3D effects to a machine with no true 3D capabilities.

SMS Contoller
They kinda suck. The D-pad is too unrespondsive and there are only two buttons as well. The small controllers are even backward compatible on some systems like the Atari 2600 and 7800 to some degree.