It was really worth it to watch these two episodes. They told enough about Kiritsugu. The guy is very lonely and that really sucks. Kiritsugu lost his friend and family. Kirei lost his wife. They both have some things in common.
I like Iri and Saber, but I don't see Kiristugu as part of the team. He is just so isolated.
Anyway I'm looking forward to see when Kirei meets Kiristugu.