Definitely gets at least a 4 star just for the difficulty in making 3D model kinds of movies.
I think voice actors really would have helped this a lot. I will assume you made this yourself and couldn't find suitable voice actors or didn't want to deal with lip syncing issues. Even if the mouths don't look right it would have been better to have voice actors though, especially since this is not otherwise a silent film (it has sound effects, etc...).
The text is a bit hard to read in places as well.
The lack of voice acting combined with the difficulty to read the text in some cases is where the minus star comes from.
Model movement looked a bit wonky, but I understand that may be a difficult thing to get right so no penalty there.