Well to be fair, he could have done more, then again he wasn't given a whole lot to work with. His reaction to seeing Claire was great in my opinion, because it could have fallen through as a forgettable scene; atleast for the fans of the movie series like myself. I appreciate his intention of adding depth to the reunion.
Anderson could and should have done more with the brother/sister storyline, but he went with Alice and Wesker instead, sigh...I just think he could interwoven them all together, he just chose not to. So many things could have been added to it. Resident Evil movies have been the trend of action over horror and action over story, which I get. I think, that if you can have them all, you should because it makes the movie that much better, and that is not even counting the fact that they've drifted to an alien universe when reflected to the games. I would have further explored Claire/Chris, kept Alice/Wesker, omitted the Luther, Crystal, and Angel characters. K-Mart would have been aligned with Jill in the end too. It would have kept her involved in the major storyline, albeit in a small role - but it would have kept her involved for the next movie too.