Miers is pro-life and pro-RKBA Evangelical Cristian with more "firsts" in Texas than the Dallas Cowboys......what do you want in a nominee?
Maybe some experience doing a similar job in the past? In my experience, skill at one job isn't considered a strong qualification for a job that requires different skills, even if they are in related fields. For example, as a database developer, I am not necessarily an appropriate candidate to administer that very same system.