I loved that family scene at the end. Tara has been around for quite some time already, but the gang besides Willow don't actually know her that well, shown by their conversation of not knowing what the hell to get her for her birthday. "She's nice!" "Oh yeah, she's really nice!"
But in the final seen, Buffy sees just how much being a part of their group (and being with WIllow obviously) meant to her and how she desperately wanted to stay. So they realize that yes, she does belong with them.
Plus Spike was awesome in that scene.
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The batman villians all seem to be one big joke that batman refuses to laugh at - SantaRPG