Having only just gotten around to watching this fourth series of the revived show (via repeats) I can honestly say that I am glad that I didnt bother devoting time to watching it when it was first on as the series for me was one big letdown after the brilliant previous series. While I was wary of Catherine Tate being involved with the series, its not here where this series run is a letdown (although her character is rather annoying and comes across as a creation from her so-called comedy show. Why the writers decided to do this I dont know) it is instead the stories that let the series down.
Firstly the series highlights for me were The Fires of Pompeii, The Doctors Daughter (which had a classic Who sort of feel to it), Midnight and The Stolen Earth, the latter of which is ruined by the unnecessary return of Billie Piper as Rose (it took away any brilliance that final scene of series two had!), a ridiculous regeneration scene and a part two (Journeys End) that is over blown and uses so many reset buttons its beyond belief. In addition to the finale we have some ok stories throughout the series but thats just it ok stories, nothing really that stands out, even the usually brilliant Steven Moffat gave us a slow, plot-hole ridden story and the smug character River Song, who I am not a fan of.
All this said however; the effects that are present are amazing, Tennant proves his worth once again (although I still prefer the darkness of Eccleston), the brilliant Bernard Cribbins pops up now and again giving us some great moments and we get to see the return of some companions. Sadly the scripts are not up to the standard that has gone before, with very few of them having a decent and watchable plot, which along with a few minor gripes lets this series down. One final thing, try and spot the kitchen sink in the finale!