Good episode, though it left me feeling rather sad. I also liked the near-development for 13 (it's interesting that they note that her disease is progressing faster rather than slower).
The interaction between Foreman / 13 was also interesting to watch. I almost felt them starting to bond a bit.
I like Lucas, though I"m glad he's not regular enough to be in every week. The show's cast already feels too large to give everyone ample screen time, given the nature of the show. I'd like to see more Kutner development in the near future, come to think of it.