I must admit that I never saw Radagast's character in a funny light, but this really changes things. I'm truly beginning to believe that Radagast (and his bunnies, of course) are going to be one of the huge highpoints of this trilogy. I can now see what Sylv meant by "It's not the Bilbo role, but could be bigger", because after seeing about 5 seconds of him onscreen I prefer him to Bilbo's character.
Seeing it in motion makes a big difference, I think.
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The concept art that got circulated was stationary and I don't think it was designed for distribution. It looked like some senile fake Santa Claus had accidentally tied some rabbits to his fake sled. I think it was largely the quality of the image - and there is a difference between an image sketched out to communicate a raw idea and an image designed to embody that idea.
I think the way the rabbits moved reminded me of dog-sled teams and it worked great for the few seconds it was shown. This may be a posterchild for not showing too much of a movie before it is ready. Subtle details can make a big difference.
it seemed too.. silly or something. I didn't see the image when it was originally circulated, but it sounded very strange.
However, seeing it in the trailer has changed my mind, and also because a friend of mine who is a bunny enthusiast showed me pictures of the Flemish Giant rabbit!! They are quite huge, and a team of them could probably pull a small sled, at least!
I'm willing to give it the benefit of the doubt. Like others, I'm hoping not to stray too far into Narnia-like territory, and this sort of thing is a risk for me. But I think/hope it will not impress me in this way in context in the movie.