For me, it all just got my blood rushing-
"Where; where would someone go to activate the other rings?"
(Guilty Spark hessitates for a second, suprised by Miranda's lack of knowlege on the subject)
"..Why, the Ark!"
(The Arbiter comes in from the darkness)
"And where, Oracle, is that?"
(Cut to black)
I personally found that to be a masterful segway into Halo 3, and my god, did everybody think that it was gonna be on Earth.. whoo.. Halo 2. What an amazing story, what an amazing game..