I'll take the erm...honour then. I'm afraid you haven't made it more epic at all, just some colour correction and a different soundtrack. If it's for fun then fair play (as I imagine it is) but for something like this to truly impress, it'd have to be akin to a machinima. I wouldn't be discouraged however, give it another shot, perhaps try to do it without the GUI, or try cutting between different shots. Or better yet, if you posses proper video editing skill, you could aim for something similar to this where you mix various elements together.
I was aiming to show off the whole scene with as little cutting and editing as possible, but to make it more suitable for Youtube purposes - It's my first time editing Assassin's Creed Videos so I'm a tad nooby! P.s. that video you linked is awesome, definitely one to reference back to at some point