The Wonder Years was an epoch series for me because it was the first that I could really identify with in my childhood in the 90's. Every episode was an "How true !" or "Oh man, I was there" kinda thing.
Whether it was Kevin's antics with his friends, the big brother issues, the events with his parents, Winnie - the eternal childhood flame, Paul - the best friend with your ups and downs it was all characteristics of the events that may happen in any childhood then.
The show also had a comic element to it which was sometime quite subtle.
All in all, this was an amazing show for me.