A friend of mine in England, responding to my own comments, has written rather amusingly about the strengths and weaknesses of Peter Jackson’s movie adaptation of The Hobbit:
 
I agree with you about Radagast the Ridiculous. In which context I noted that one of his er unusual means of transport team was none other than Bugs Bunny (there is a brief glimpse of the characteristic pose and goofy grin). Not a character I naturally associate with Middle Earth. The chase he leads the warg-riding orcs looks like something out of a kiddie cartoon also. The dwarves fighting their way out of the orc caverns also seemed to enjoy the miraculous immunity to physical injury I associate with Messrs Tom & Jerry.

That said, I still think the film gets a thumbs up rather than down. It is (mostly) not up to the standard of the LOTR films, but then The Hobbit as a book is not up to the standard of the LOTR books in my view – it is an early essay in the craft, as it were. Cate Blanchett as Galadriel was much better in this film than she was in the LOTR ones, where in some scenes she would have made a fitting co-hanger-out in Greenwich Village with Radagast the Stoned. In this one she achieved a measure of majesty.