The biggest complaints are poor AI, poor pathfinding and it behaves like a dog.
Apparently Battlefront sent out review copies that were version 1.0, which was unstable and bad. By the time it comes out tommorow, there will be a patch out. And they swear the 1.01 patch fixes all of these problems.
After Theatre of War, we'll see.
I'm holding out hope though. The previous Combat Mission games were some of the finest ever created, and I've been waiting years for this one.