I recently purchased Combat Mission Black Sea and Normandy. In general, I like, but do not love, both games. The graphics are great, especially with all the neat mods. You can zoom out to follow all the action or zoom in to follow just a small part.
But I have two issues with both games. One issue is that I cannot tell line of sight at all. I cannot tell a unit's line of sight without using the target function. In addition, I have no idea about the LOS from any point on the map. This makes it very difficult to properly place and move your units for maximum usage.
Also, I cannot use artillery to bombard anywhere unless a unit able to use artillery has a line of sight to the desired target. This unrealistically restricts artillery. Many times artillery, mortars or howitzers, were used to bombard suspected enemy positions. I can use aircraft to strike targets not in any line of sight. The same should be true for artillery with reduced accuracy.