Between these reviews and it being written (in part) by Neil Gaiman, I might actually change my mind and give this a try.

http://www.strangehorizons.com/reviews/2007/11/beowulf-comments.shtml
http://network.nature.com/blogs/user/henrygee/2007/11/19/bigging-up-beowulf
http://www.christianitytoday.com/movies/reviews/2007/beowulf.html
http://www.catholicnews.com/data/movies/07mv233.htm