In all honestly I thought this would be better. Although it was entertaining enough, two things stood out of the video for me. The terrible acting and the fact that it would take a huge budget (in comparison to what they had) in order to make this look any good. It is possible though.
It is actually pretty great if you take away the actors (cheesy lines, weird poses, bad acting). The effects and battles are rather good and entertaining.
As 'DaRkOwNs' said, if this was made by professionals it'd be really good.