I'll give this a solid 4; it's not bad in the slightest. I like the overall feel of the song and the transition throughout very nice job on that. The only things that were a bit off to me were the repetitive aspects of the song and it seemed like more 'action' needed to be in the middle of the song to give it a better sound. Despite these however, the song was very good and not half bad for a ambient song in a movie or game it fits that role perfectly.
Please contact me if you would like to use this in a project. We can discuss the details.