This statement is clearly a matter of opinion. Some people had horrible experiences as children and others had great ones.
My experience as a child was a positive one. Three things come to mind, especially as I compare it with my life as an adult.
First, I had few worries, because I had very few responsibilities. As long as I was doing well in school, I could do whatever I wanted. Playing with my friends, making models, and playing video games was the way I spent most of my time.
Second, I grew up with many family members who lived close by. For this reason, I grew up with love and affection. This was a very positive experience.
Third, my immediate family was awesome. My parents were always there for me and we did a lot of things together. I remember many fishing outings and seeing new things.
In short, I was blessed to have a great childhood.