Eh, in moderation it's fine. My kids get a couple hours of screen time a day, maybe even a little more sometimes. Both are at the top of their respective classes in school.

But I've also been careful to keep them aware of the consequences of their various choices (screen time, junk food, etc) and they self-regulate pretty effectively. Although my daughter is currently addicted to fantasy novels and I may need to help her dial that back a little so she gets enough sleep at night :).

If you are actually asking if television can be part of a healthy child's life, I would say absolutely. For example, I watched Sesame Street in the 1970's and my kids watched it in the 2000's and the quality was still great.