Well, I liked Bill the Pony. Fatty Lumpkin was just kind of... well... just seemed out of place. The whole Bombadil episode was more of a"Farmer Giles of Ham" type of thing than a "Lord of the Rings" type of thing. In my opinion. :D
BTW, nice horses!
Bill was a very good pony too... I just loved the name Fatty Lumpkin.