One path that might help you work out your own personal justifications is to find two forms of entertainment you enjoy at near equal levels, but where one you view as valuable and another as a waste. Then look at how both impact your life and see if you can identify what makes one valuable and the other a waste. This not only gives you a good inside view of what is happening with both forms of entertainment, but removes any bias to see your own version as superior because both forms of entertainment belong to you.

I did this, found two things I did for fun, both consuming significant blocks of time. The one that felt useless left not real impact. I want to do more of it, but after spending hours on it, I'm no different than I was before (other than perhaps a bit more skilled at the form of entertainment).

The other form, which was the same thing from an outside perspective (for example, my parents would see them as the same) left me different. It led to me building new goals, reevaluating things happening around me, spend more time thinking about where I'll be in 10/20 years. It led to me walking an hour a day and to start jogging some to build my endurance, despite the form of entertainment being unrelated to physical activity. I don't think this is innately a property of one entertainment form over another, but more about my personal relationship to entertainment.

Using this, how do 'poorly regarded' entertainment impact those engaging in it, compared to 'well regarded' entertainment? Are their lives better for it?