First of all, I'm completely unspoiled, so tell me nothing about next week. I knew we were getting a companionpalooza, of course, but I didn't know that Harriet Jones would be back, and that made her reappearance doubly awesome. (I note we did not see her being exterminated, so I have some little hope she survived.)
I enjoyed almost the whole thing. The only real irritation was the huge cliche of the Doctor and Rose running towards each other. I kept telling myself that Jack would materialize at that moment and when they went to hug, there he would be, sandwiched in the middle. So the Dalek came as more of a letdown than a shock.
Other favorite moments were Donna's face as the Doctor conversed with the rhino police, Jack hugging Ianto (and, yeah guess Gwen was in there too), Dawkins (who I believe is married to Lala "Romana II" Ward) making a cameo, everything Donna's grandfather did and said, and Sarah Jane telling Mr. Smith to cut out the fanfare already.
I'm hoping to love next week's episode, but I have huge worries for Donna. (None for the Doctor. Just curiosity about why they keep showing the severed hand.) Whatever happens to her better be very, very satisfying in a narrative sense, because she's very high on my list of favorite companions.
In short, I thank the makers of that episode for giving me something I could really enjoy, in spite of my current case of the blues.