No one is worth reading solely because the “mainstream media” doesn’t like them. People who jabber complete fiction are disliked in that way. Doesn’t mean they’re worth the time.
Glenn Greenwald in particular depresses me. The days of his blockbuster stories feel like distant memories, now he just posts poorly edited (or more likely not edited at all) opinion pieces powered by nothing but rage. I genuinely don’t get why people would pay for it.