I don't find Thor's worthiness hard to accept at all, obviously he is a great and noble and awesome hero. But so are some other heroes. When the writer claims that Thor's worthiness is objectively, canonically superior to the worthiness of every single other hero ever (with the one exception being an alien that never struck me as particularly grandiose. Bill can lift Mjolnir, but Steve Rogers can't? Really?), and never bothers to show nor explain how, I'm going to call bullshit.