I haven't had a chance to build it yet, so for now it seems quite "meh" just from the outside. And you're probably only paying to get the mini figs. Unless you can get extra bricks and pieces to build more trees, then you can literally have the Forbidden Forest.
Have you got 4738 Hagrid's Hut? That would be a much nicer set to get if you wanted to get it for Hagrid.