I didn't like the (apparent) reasons for the proposal. Castle seems to want to bind Beckett to him no matter what she chooses in regards to the job offer. It's kind of sweet but at the same time a little suffocating. He's putting her under even more pressure and they still haven't talked about where they stand in their relationship. Complicated as always.
I'm looking forward to next season (already confirmed!) to see how Marlowe plays this one out. I haven't been disappointed in the ride so far.