Okay, I've sat on this for over a week now, waiting to see how it ends, and I can be quiet no more: these were absolutely horrible episodes and I want my two hours back. And this isn't just because I don't like Moffat (my favorite episodes are a pair that he wrote. I can admit he's a good writer, even if I don't like the man himself), although it definitely bears all the signatures of what I dislike about the man himself. These were horrible, terrible, unoriginal, alternately boring and frustrating episodes.
Stephen Moffat has shown he is nothing more than a 12 year old female fanfic writer inside a man who was given the keys to the kingdom: he uses his power to completely belittle every character he didn't create and poses a threat to those that he did, and the characters he did create are the very definition of "Mary Sue". If you look up "Mary Sue" in the dictionary, you'll find a picture of River Song next to it. Spend a few years reading fanfiction, and you'll see every annoying trait that makes Mary Sues so reviled show up in her: love connection with a main character, perfectly competant characters suddenly seem imcompetant and useless next to her, that name, her smug superiority...I was hoping she'd die and just stay there.
There is no damn way this had to be two episodes, considering the last episode was largely boring standing around and talking (and the Doctor telling Donna to shut up and her just taking it? What the holy living hell?) and what little action there was was boring, predictable from moment one, lifted from other, better Sci-Fi (and some of it Moffat's own works), and was in no way scary or suspenseful.
If this is what we have to look forward to in series five, then I might as well stop right here.