If this is their strategy, DC is fricked. Marvel's line-up is like a who's who of Hollywood A listers, not some fricking WB level bull shite.
Iron Man made RDJ a superstar. He was a star before, but Iron Man blew him up. And it's not like Hemsworth was a star before he was Thor. He was the father from Star Trek, that's about all we knew. The biggest star had the smallest (and maybe most important role).
DC does a lot of shite bad, I've said almost every decision with SvB outside of Affleck was terrible. But this isn't a terrible idea, it's a gamble and a safe play at the same time.