If properly written, Thor (even before possessing the Odinforce) is easily the most formidable of the heroes listed—if one factors in the cosmic powers he's demonstrated over the years. [The Silver Surfer, sometimes listed as his better, actually admits that Thor is more powerful.] On the other hand, if he's written as a bruiser with a bludgeon—Kurt Busiek's favorite portrayal—any number of those listed can whup him.
In a ten vs. ten free-for-all, though, the DC heroes are going to win far more often than not.
In a ten vs. ten free-for-all, though, the DC heroes are going to win far more often than not.