I remember our family visiting friends who had Pong playing on the TV. This must have been the late 70s. I was instantly mesmerised.
Not long after that we got our own version of Pong, with the Sheen M-1200 Microprocessor Programmable TV Game, which was a clone of RCA Studio II. With that primitive console we also had Doodle, Pattern, Bowling, and Black Jack 1 & 2.
Then came the Atari 2600 which was unbelievably cool for the time. Those simple, primitive games held the attention of children just as much as modern titles which take teams of people and years of development to create.
Oh, and the kids back then really enjoyed their games through and through. Unlike games today which require 40+ hours to complete, and end up on the shelf uncompleted because the next best thing has arrived.