I thought it was a great cover
Fit quite well in the BSG universe. To each their own though: music is certainly a different experience for everyone.
As for the point of season 3? Episodes 1-5 (counting the 2 hour premier as episodes 1 and 2), 11-12, and 17-20 (although 17, "Maelstrom," wasn't a particularly great episode). The other episodes weren't generally all that bad - in fact, I quite enjoyed a few of them - but having so many such episodes in the season really dragged down the momentum. I would have preferred to see them spend the first half of the season on New Caprica - plenty of storylines available there - and then quickly move on to Eye of Jupiter and Rapture in the middle just like it was, followed by Collaborators and then a couple of the more character-based episodes leading the the arc of the last 4. Would obviously require some tweaking to make the episodes fit together that way, but I think the pace would have been much more steady overall.
Either way, what's done is done. I'm looking forward to season 4