I also found Kate's story about what happened to Aaron and why she went back a bit of a let down. Wasn't very traumatic or mysterious.
I liked the time travel discussion between Miles and Hurley a lot, they should have been having this talk from the beginning not just now.
What Jack did and what Sayyid did created evil Ben? They also gave him a convenient excuse as to why he didn't remember any of them. Wasn't very surprised the ew website said Jack refuses to help Ben. But evil little Ben returns to them at some point doesn't he, so he can kill them all.