Mhm I do like the look of him. He should definetely keep the facial hair. However, I do agree with above comments: a female detective would have been great.
I'm not sure I'll be keep watching without the Matt/Ronnie partnership though. It'lle be hard to recreate that kind of bond, especially since a lot of their closeness and cncern for each other seemed to be based on them working together for quite some time.
Also reading the episode descriptions I can't but wish that Jamie would have at least stuck around until the end of the season (since 17th precinct wasn't picked up anyway). I would have loved to see Matt in the 24 hours ep and him falling for a victim would have been interesting too. I'm curious if they're gonna reference him from time to time. I hear poor Archie wasn't mentioned much after he was gone...