I have to say, despite the fact that the rendition was pretty.. Well.. inaccurate, I enjoyed it. Depressing, but it showed that nifty truth in human nature that even "heroes" aren't perfect.
I don't remember where I heard this, but apparently, during the movie, every time that they did something that was off-kilter from the real storyline or wasn't included in the original work at all, it was actually mentioned by one of the characters saying something to the effect of "That's not how it will be written about"; is this true? Because, I actually do remember two occurrences of that being said, but I didn't know about it beforehand, so I wasn't really trying to listen for it.
I did try to count how many times "Beowulf" was said. I lost count pretty early in.
The whole "I am Beowulf" yelling thing wasn't as cool the second time of yelling. I mean, you can only make one Robot Chicken about it. And they already did it with 300; it's old news, now.