Titanfall producer Drew McCoy has said in a NeoGAF post that the game is "tough" to market because of its lack of a single player campaign.
"It's actually been really tough trying to accurately market Titanfall. If you look at what we've done, its a lot different than what most FPS games do. Without a bunch of highly scripted [single player] moments to recam from different angles, the usual 'movie-like' trailer is just about right out."
This has meant that Respawn has used unedited gameplay footage instead of cinematics in trailers:
"Instead, we've decided to show unedited gameplay segments that last 3-5 minutes (so far – more footage coming, of course!) to show the 'flow' of the game. Starting as a Pilot, taking on AI and other player Pilots, wall running around a Titan, earning your Titan, climbing in, battling other Titans while stomping on humans, ejecting, etc. There's a huge amount of gameplay mechanics available at any one time, and encompassing them in a few minutes is actually quite hard to do.
"Its also why we took an extremely early pre-alpha build of the game to events like gamescom, PAX, etc to let normal dudes hands-on time with the game. There's no amount of polished marketing that can replace playing the actual game."
Respawn has defended the decision not to include a single player campaign on the basis that it's a costly process and the developer would rather focus on a strongly narrative led multiplayer mode.
Last week, the developer justified the decision to limit play to 6v6 games.
Despite McCoy's concerns, it's fair to say that there's a fair bit of hype for Titanfall before its launch on PC, Xbox 360, and Xbox One on March 11th.