I agree with you that Mirror Mirror is a mundane Menken score but I am a fan of him and it is rare for him to score a movie without composing any song. I will give this 3.5 stars but since this site doesn't have a half star, a weak 4 star rating perhaps.
(Message edited on Monday, April 16, 2012, at 7:19 a.m.)
While this score certainly isn't Menken's best, it's still highly enjoyable with great themes and melodies. I would give it a solid 4 stars. Would love to see more non-musical Menken like this, but maybe less lighthearted and more dark and intense. He definitely has the talent.