Back in the 80's : 
Rock the world, with only your own mental speed you could spent hours and hours with: PITFALL, SPACE INVADERS, DONKEY KONG, STAR WARS, TRON, MARIO BROS, JOUST, INDY 500, JUNGLE HUNT, STAR RAIDERS, and so on....I´m sure you would be amazed with the numbers of titles released by ATARI, and with just one button you could do so many tricks
in the most present time I would vote Playstation 2 of course.
I grew up with Nintendo, but had Atari consoles & maybe a few others. Was born in 1985 and got into Atari a little in the 1990's and it was exciting and mysterious to play older games from the 80's and 70's, even as they were older.
Same here and thank you fro all your comments :)