This might be very subjective, but NES games were actually enjoyable. 2600 era games, while they were enjoyable for the time, were instantly obsoleted IMHO once the NES came around and you had games with stories, no matter how thin, and endings and such. The whole "high score" era of games, I personally have no interest in going back to those at all. Maybe one or two games of Grand Prix and River Raid, but I know I would get bored really quick.