I agree, in the beta right now the external mirror is pretty much blurred out. But remember its still a beta and the external mirror is a pretty big thing in a racing game so when the game comes out you most likely will be able to see out of them.
Agreed with you ELEMENTAL_BRAVO. NFS SHIFT got it, i'd just give it a test. And It would be unforgivable to deprive us of this especially in a racing game. Some crafty, bright minds that have hit me in the races, had understood this grrrr....