There are a few things that the game lack of, such as an engineer unit (whose role would be to construct obstacles), buildings/vegetation to hide in, side objectives such as fighting for the possession of, let's say, a wizard's tower who could then cast devastating AoEs every X minutes.
Those don't really seem compatible with the game. It's too fast-paced for obstacle-builders, CERTAINLY too fast for things to hide in, and I don't think that there will be a lot of potential for side objectives in the bulk of the campaign. It's just not that kind of game.
Heck, the game's basically too fast-paced for even the minor obstacle building already in the game (mines) to be very useful.
