In all their sincerest efforts to perk up the single-player, the developers obviously haven't spent much time in optimizing the AI code. There are plenty of areas during solo play where players are likely to stumble due to lousy pathfidning. The lack of co-op and multiplayer is indeed a serious oversight, guaranteed to upset most gamers, particularly those who appreciated C&C: Red Alert 3.
You may enjoy the four main campaigns like the Yuriko Omega chapter is great and feels quite different from regular C&C scenarios). However, there won't be much to take up your time once you're done.