DCS 1.5 greatly alleviates the spotting problem.
Ape brings up some very good points. In reality, you don't see in pixels. Your eye can see contacts very very far out, and the brain superimposes the silhouette of an aircraft so you know something is out there whereas in BoS, it really feels like unless you are within a certain distance of another airplane, it will not even render.
Also, navigation is horrible, but I think that's just because of the boring russian landscape.
LOOOOOOOOOOOOOOOOOOOOOOOOOOOOOL WHAT. I've got a few hundred hours in the BF-109 in DCS, and spotting other WWII airplanes in DCS with EDGE is 10000000000x better than it ever was, what are you talking about?