How bad is it? Poorly animated Christian story for small children with some problems.
Should you see it? No. (If you're a conservative Christian with small children... maybe.)
First, this is NOT the 2012 documentary with the same title! Ernest Borgnine, Michael Madsen, Sandi Patty, Scott Eastwood and several others do the voices of barnyard animals in Israel during Passover at the time of Christ. Holy animated slapstick crucifixion, Batman! The animation is poor for a theatrical release - the animals all appear to be the same size - and the film seems slow, even with continuous pratfalls. A lamb that calls himself the Lion of Judah is saved from sacrifice by his friends and they eventually learn who the real "Lion of Judah" is. It's a bit weird to see a pig where none are raised and the Biblical meaning of Passover for the Jews is glossed over very broadly, but I suppose this has its audience and they won't care.