Why dont people like this movie?

I personally loved this film. i didn't think it was that great in terms of story and overall plot but it was cool to look at (especially if you saw it in IMAX) and Beowulf is such a great aggressive hero. For much of the same reasons as why people liked 300, is the reason I found Beowulf so entertaining. His constant shouting and epic tales of killing monsters was intense and fun. How great was his speech as he kills Grendel? Cant quote it exactly, but great finishing move with "I AM BEOWULF." and just chops his arm off. Perhaps its because I have never read the story but I think people should stop hating on this film so often!!! The story ends well and every thing has reasoning to it in the end, those who like the Viking style culture/ action in the Mead-hall will like this film