Not suitable for kids?
One immediately noticeable fault in Beowulf is that of its 12A rating. With unsuspecting movie-goers leaping out of their seats in the very first scene, the distinct violence and sheer horror of Grendal leaves one with little other than disbelief. I'd assume it left the children in the theatre with little other than nightmares.
Furthermore, lead character Beowulf has an obsession of fighting monsters whilst completely nude. Though many imaginative obstacles were used to cover Beowulf's more sensitive areas, not a lot was left unbarred. Jolie too, as Grendel's mother, remained largely undressed and perhaps more surprisingly, largely without nipples.
Though the children may marvel at the eye popping visuals, be warned that this one isn't entirely for the faint hearted. It wouldn't indeed be a stretch of my imagination to say that there were even adults in the theatre who didn't find it completely comfortable.