I think Moffat is getting too much abuse on here. go on Wikipedia (yeah that reliable source!) and check a list of Who episodes since the re-launch. he is linked to nearly all the great ones and has brought some great additions and moments to the story (River Song, Weeping Angels, Torchwood, Captain Jack, silence in the library, blink, beast below and so forth). he is a big who fan, a comedy writer obsessed with horror movies. the perfect mix to have the job. but...
and wait for it...
THE BBC ARE TO BLAME FOR THIS.
I feel moffat needs somebody to wind him in and supervise (like RTD did) and to ensure that things flow. he is lazy at times (how many episodes have now been solved by a magic wave of the screwdriver/wand, a press of a magic button or a complete re-write of history despite repeatedly being told it's not possible?), but he is a fan and has a vision. the episodes are crammed (should be 2 parters most of them or simplified) and the need to have a shocking finale is ruining the lot -why can't it just end and start up again next year??? we got by for 4 decades without cliffhangers!
I also think people have unrealistic expectations. where has this need for a 50th anniversary came from? we didn't have one for 40, 30, 25, 20, 10, 5 or so forth. and they have been bigging it up for so long that people are already complaining before it's been seen. it's been leaked Tennant is coming back and people are complaining Barrowman isn't or either is Ecclestone or any of the classic ones. Tennant is coming back -surely big news right? why would we need all of them returning at once. one is big news...but people are disappointed!
tennant's incarnation is finished as far as i'm concerned. would be nice to see him but not bothered if I didn't. McCann deserves a death scene, would rather they did that somehow and explained the gap between the first run and the relaunch...
moffat isn't the problem, the job is unrealistic (is it for children or adults? is it homage or modern? what is in the whoniverse and what is omitted? does it need a big finale AND an anniversary special to blow our minds? why a constant need for "important" companions, in the past they were little more than a narrative device that was killed off routinely and so forth).
moffat is best man for the job, but it's an impossible job that needs half a dozen writers to churn out scripts at that rate!