I remember rather enjoying this adventure when I watched it, partly because it got the TARDIS crew away from contemporary Earth and back off into the far reaches of the galaxy (and because it was pretty epic in a lot of ways). Probably the biggest complaint I have about the Who revamp is the way it hangs about on Earth a lot more, rather than having random adventures on alien planets in obscure parts of the Universe.

I suspect you're right about the whole devil/temptation theme, but I don't think it detracted much from my enjoyment. I liked the doomy atmosphere of the whole thing.

Did the Doctor ever try to save the Ood, or did he just not have time to attempt it? I can't remember offhand. Haven't watched it for a few years, I really must dig it out sometime. It fell victim to my obsession with Primeval, like a lot of other shows I keep meaning to rewatch :-D