I love being a big bear. Incarnation with the kiril buff and hero is just awesome. I only say incarnation because bears look badass with that up I've always felt like bear form is a little in the small side, but at least we're bigger than gnomes and goblins.
I do find it slightly odd that there are no small races that can be druids, only big to bigger races, and we all turn into the same size in bear and cat form, and they are both kind of small.