Just finished it.. teared up at the end.
I think it's great they spent their life exploring a past era. They would have been bored to death in the present sans Doctor but now they get to say.. "hey, doesn't some amazing happen in Paris in X year.. I think it does! Let's go take a look!" It will be endlessly interesting to them.
I feel sorry for Rory's dad BUT.. I wonder if River will pop in and visit her grandfather some time.