It’s a nice idea for a piece of music - but I have 2 general thoughts on why it was rejected.
-
Composition - This is a very specific, somewhat artistic idea; the “play against picture” concept where some sweeping melody and powerful emotion plays over a battle scene. But this is pretty nearly the ONLY scene that this would be any good for - the marching drum almost requires it to be a battle, but the quasi-laid-back groove aspect of it means that it won’t work even for that situation. So compositionally, this doesn’t function well as commercial music, just from the concept itself.
-
Production - Epic is going to tend to require a very highly produced sound, and the mix and samples just aren’t getting it there. Go listen to Two Steps From Hell or Audio Machine on Youtube and you’ll hear what I’m talking about - massive pounding drums with strings that sound almost live (or actually are live, which isn’t something you have to compete with here so much), and a very, very controlled mix between all the elements. Your synth sweeps and risers are too loud and harsh, the drums aren’t beefy, and the strings have a very MIDI quality to them. I suggest everyone to read this “tips” page to see about improving your sample sound. http://music.tutsplus.com/tutorials/the-ultimate-list-of-tips-for-producing-sampled-strings--cms-21216
Sorry for such a rough view from me, but I hope you find this helpful in some way.