HBO is expensive and most people don't have it. Ergo most people never see or hear about their lower quality content. Only the good stuff that their rich friends rave about.
You not recognizing their shows doesnt mean they are bad. Ive seen most of those and the overwhelming majority are at least solid. I understand netflix's business model, Im just annoyed that theyre buying HBO because they will likely make it worse. Maybe netflix wants more prestige content and will let HBO be HBO but I doubt it.