I agree with the thoughts about Rabbit, he didn't seem himself in the 2011 film. While I still liked him, it seemed to me they changed him a little bit in an effort to make him more popular. Kanga and Roo are in the film so it would be hard for me to name any other character the worst as I've never really liked either of those two.
Tigger didn't appear nearly enough either, so that's a vote down from me. Pooh is all about characters, though they did attempt a full length plot with this particular entry I still say the characters and their iconic personalities are meant to carry it. The lack of Tigger and alterations in Rabbit set this down a bit from where it was. The Backson is probably my favorite song out of the franchise now, though.
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Still smilin'
:>