One of the best parts about the advent of the internet is that the true fans of any subject have the ability to show their love. The fans with an eye and passion for video games have been the best.
After the massive failure that was the Mass Effect 3 ending, a huge uproar came from the fan base that was very disappointed in Bioware. Stuff like this usually means jack squat because the developers either don't care, or can't afford to do anything about it.
When this happens, you will usually get people who will want to put together a fake ending, or try to code their own ending. This fan decided the launch trailer needed to be better. It mixes elements from Mass Effect 1 and 3 and looks bad ass!