The Starbuck "reveal" (Which I found to be the opposite as it was just raised questions!) bothered me in both its concept and execution.
The entire show we're told Starbuck is *sigh* The Chosen One and it turns out that means she'll be replaced by an entirely unexplained mystical angel that will lead them where the plot demands? It's just lame. There's nothing for me to chew on or think about there. "God did it!" is just... boring. I like RDM as a writer but his spiritual views are really simplistic.
When John Locke in Lost was replaced by MIB it at least had a point to it and was thought out on some level. Spirituality in NuBSG is pretty much the opposite of what I'd expect from a show. Endless strings of visions and divine intervention that rid the show of consequence and are never explained or cohesively put together.