Next Generation has a nice overview.
In videogames, as in life, we tend to get things right about a third of the time. There’s one decent Sonic game for every two disasters; one out of every three consoles can be considered an unqualified success; the Game Boy remake of Mother 1 + 2 was released in one out of three major territories.
With the same level of scientific accuracy, one can easily say that, out of the thirty years that videogames have acted as a consumer product, there are maybe ten really excellent milestones, spaced out by your 1984s and your 1994s years maybe we were all better off doing something out-of-doors.
It kind of makes sense, intuitively: you’ve got the new-hardware years and the innovative-software years, spaced out by years of futzing around with the new hardware introduced a few months back, or copying that amazing new game that was released last summer. We grow enthusiastic, we get bored. Just as we’re about to write off videogames forever, we get slapped in the face with a Wii, or a Sega Genesis and then the magic starts up all over again, allowing us to coast until the next checkpoint.