That's like saying the SG-1 episode "Window of Opportunity" is 'useless' because it's not about the war with the Goa'uld.
A lot of people love that episode, myself included, despite it being a very obvious point in the show it went from serious to silly, even though it still then ends on a very serious note given what Jack says to the scientist about loss.
A lot of people love that episode, myself included, despite it being a very obvious point in the show it went from serious to silly, even though it still then ends on a very serious note given what Jack says to the scientist about loss.