I've read 'em. In fact, I work in a comic book shop, if you really want geek credentials. Beta Ray Bill is a horse in a Thor costume. While kinda cool looking in a what-was-Walt Simonson-smoking way, Billy just waon't play to middle America. The only vaguely cool storyline Thor's had in quite a few years was the Disassmbled arc, and all that was was the Ragnarok myth, pretty much word-for-word. (Although Oeming did a great job translating it.
Thor's one of those guys (like Cap) who just works better in Avengers or guesting in other people's books.
And, yeah: I'll give you Surtur. Thousand foot tall fire monsters are always cool. But Mangog? Simmer down, now.