I would have to say INTELLIVISION was the greatest of all time.
It offered immensely enjoyable Sports games that still aren't horrible to play today.
Baseball, football, basketball, hockey (awesome) were a blast.
How about the Sim: UTOPIA!!!!!! This was Sim City before it even existed. Crops, revolutions, storms, morale etc.
Sea Battle: Fun!!
This was much more fun that my Atari which I loved. But Intellision from 1981-1985 was the QUIET KING.