i'm pleased and darn impressed with it overall, but i have noticed a few things that i'll have to tweak.
there's a couple of critters i think should be classified as a different type (can't think of any off the top of my head; most were beasts that i'd make humanoids or monstrous humanoids, or something like that).
also, there's quite a few beasts in the book with an Int score above 2. (the MM errata states beasts can only have a 1 or 2 Int, like animals.) so these i'd either drop to 2 Int or change their type (to either magical beast, monstrous humanoid, or possibly aberration, whichever is most appropriate).