I guess the fact Ryan Phillippe was Sebastian helped a lot. He is, after all, very eye candy and he played Sebastian to the T. Amy Adams was a pretty decent Kathryn but then SMG was a better version as well.

Oh yeah, I wanted to see CI3 because of one or 2 actors (okay Kerr Smith, really) and I liked it but it's not one I will see again. Nothing to do with Kathryn or Sebastian... more obvious for Sebastian since he died but Kathryn is mentioned like once as being in rehab or something and the movie is centered on a cousin.