The teaser is actually the dvd intro he had a long time ago. I don't really think it is much of a teaser. He should just wait and put out a trailer.
I looked at the fight scene and it needs more editing to make it quicker. I think it had too many wide shots and needs to show more of the close up shots. Maybe just edit down the wide shots more. I agree that the sound could be better too. Overall the current impression I am getting is the vibe of Power Rangers or something like that as far as quality of the footage, acting, costumes. Sorry to say. I guess to me it is more of a comedy the way it is. I don't think too many people will take it seriously.
The cgi is pretty cheesy too but fits with the rest of it. Do the best you can with what you got. Improving the sound would help a lot. Improving the editing of the footage to make it flow better would help too.
If you are looking to make this like Underworld or Dark Knight as far as visuals and quality you have a long way to go. You will not make it with this production. But maybe you will do better in the future. I don't mean to put down what you have done. We all know it is not easy and expensive and time consuming to even get as far as you have. It takes time, experience, money, the right crew, the right actors, the right post production, etc.... to get the quality needed to reach the realm of Dark Knight or Underworld. Good luck.
My thought is you need a better DP, actors, editing, sound design, and cgi for your next project. Don't give up on your dreams sometimes it just takes time and experience to get where you want to be.