Being of grammar school age in the '70s, Pong was the first one for me also. It was a pleasant diversion whenever we found a machine at the local pizza place, but nothing more. Space Invaders was the first game to really become popular with me and my friends, and then Pac-Man was the one that really made me want to go to an arcade and pump some quarter into the machine.
Of course, a little later we became an Atari 2600 (or Video Computer System, as it was called back then) family. The other consoles were Mattel's Intellivision (high concept but not as popular) and the Odyssey (which was kind of the ghetto version of a game console).