Methinks it might be as simple as looking at the past with nostalgia glasses on. Trust me, there were piles upon piles of terrible games way back in the day. We just remember the good and forget about the rest. This makes it seem like there were more great games back in the day since we only remember the good. Just look at all the games AVGN has reviewed if you do not believe me.
It could also be standards getting higher (for example, you liked a lot of crappy movies when you were a kid, but as you aged your standards as to what makes a "good" movie have gotten stricter). I seriously doubt that games nowadays are any worse now than they were 10, 20 or 30 years ago.
It could also be standards getting higher (for example, you liked a lot of crappy movies when you were a kid, but as you aged your standards as to what makes a "good" movie have gotten stricter). I seriously doubt that games nowadays are any worse now than they were 10, 20 or 30 years ago.