The campaigns are too short. Simple. I know that it was supposed to be more of a multiplayer game, but the multiplayer is more or less just like the campaign but without medics that do their job. I'm not saying it's bad, but I just feel quite disheartened that it was quite a short experience.
Could we possibly get some new missions in the DLC, it would be nice to have some new objective types as well and maybe gamemodes for online (Such as team deathmatch, as it would be quite fast and fun with SMART and such).