I had much the same feeling about Fear Her a year or two ago, which reminds me to write up my thoughts on Silence of the Library/Forest of the Dead, as my initial reaction to the first part of that was similar. The Library itself was fine, I just didn't like the cuts to "real life". Of course I should have known better of Steve Moffatt, and it turned out to be a clever manipulation of ideas. I particularly liked the second part, the way the "dreams" inside the computer jumped from one context to another, the way the "dreams" were like reality but somehow not quite right. And it had to be made clear that it wasn't reality, otherwise the disappearance of Donna's "children" would have made it far too scary. There were some things I wasn't so keen on - much the same as strange_complex's comments here. But overall, I let them pass. I'm trying to work out whether there is any significance to the name "River Song" - obviously you can see ROSE embedded anagramatically in there, but the rest doesn't seem to make anything. I suppose I'm thinking of the increasingly implausible anagrams of "Anthony Ainley" that cropped up over the years. Then again, maybe such a feature would be too intellectual for the New Who.
So I'm guessing we have Rose back properly next week, and a three-part season finale. Let's hope it's better than last year's.