I don't mind River but I do think Moffat has developed a tendency to cram 2000 million ideas into one episode when developing one fully would be better.
Look at the mess of the 2011 Christmas special was (it was better than every RTD one but it was still a let down) and compare it to Blink.
Blink has one really good idea and it's played with just enough to be memorable.
The Doctor, The Widow And The Wardrobe has enough ideas to make three or four good episodes if they were worked on more but it ends up being a bit of a blurry sludge even with the nice performances and everything.
Don't get me started on the Blu-Ray shorts....too late.
They seem to go against the BBC charter rules about not having to pay for supplementary material to understand the transmitted broadcast.
Those scenes if you are following the River arc are essential viewing but you have to pay for the discs to legally see them and once again there is enough in there to develop into a couple of episodes along the lines of The Doctor's Wife which was in my book the best episode last year.