At first I was a bit annoyed that Barty Crouch Jr was with Voldy and Wormtail, but later I realised it helped exposit that particular thing without wasting too much time.
Plus, it means more screen time for the sexay David Tennant, doesn't it? Never a bad thing.
Can't wait to see it. (Yes, I clicked on a spoiler warning without hsving seen the film. I'm living on the edge.)