Hm.

First impression of Emily Prentiss: too eager to please for someone of her age and status.  Fortunately she got a grip fairly quickly; I like her well enough now.  Could be attributed to the development of a new character in an established show. 

First impression of David Rossi: arrogant bastard.  Hopefully this will change. 

I certainly don't miss Gideon.  And if one speeds up the theme music, it still sounds good--almost X-Files, in a way.