Hmm...they didn't make much games in 1979 I'll say Asteroids since I don't know many others.
If anyone knows a site with games history it would be cool.
Hmmm...I don't know much about video games in 1983 (besides that it was the year of the big video game market crash), but the coin-op Mario Bros was released that year. I never played it, so I really don't know if it was the coolest (although I had fun playing the Mario Bros clone in SMB3 on my NES).
1984 here, of course there are a few games that were pretty good in 1984.
For NES I say that Duck Hunt would be my favourite
Back in my days at that age; I played on a commodore 64, in that year Id say that Impossible Mission is my overall favourite to play even today I have never been close to beating the game.