It wasn't that bad, nor was it really that funny.
Although, I must say the writer has a point about letting Gríma go. That was merciful, for sure, but somewhat stupid - in the movie at least, because there he gives the crucial information to Saruman whereas in the books his words don't have an effect like that.
Maybe this proves all we who want to criticise the movies can do so.
There are a lot of stupid things there anyway, for example Aragorn's horse is of the wrong colour.
