There are some things that Halo can do that other games can't. For example, they can have a super serious trailer and have it not come off as cheesy. Titanfall can't do that. While this trailer visually looks awesome, I can't help but feel it wouldn't have been better just to throw some metal music over the sequences and not some slow talking dude talking about the "few and proud" who serve as fictional soldiers.
That's just my opinion, of course, but I think you'll agree after watching.