And the main guy behind it? Jon Favreau, the man who effectively invented the MCU formula (fights and laughs) with the first Iron Man.
Feige is good, but I'd bet more on Favreau to deliver than on any producer.
(also, Thor a "C-level" character? He's had a dedicated monthly comic-book basically uninterrupted for more than 50 years, and features an entire cast of dedicated supporting characters and locations in Asgard... He's definitely an A-lister. IronMan, on the other hand, could absolutely be called a B-lister, since he spent large parts of his publication history effectively as little more than support for the Captain America / Avengers ecosystem, with very bad stories and artists. I would absolutely call "C-listers" Iron Fist, Luke Cage, Jessica Jones, or the Guardians of the Galaxy - definitely not Thor.)