You really think it is in the "great" category? It seems to be very pessimistic about which unit can see which enemy unit. Especially right down the coax of a tank, where multiple people's optics point. With and without magnification. Still I often have AFVs not see something right in front of them that infantry spotted.
I'm not saying it is a dealbreaker, but for me it certainly doesn't count as "great".
Ok fair enough, by "great" I meant that each unit spots separately and that the game tracks each unit's knowledge of other units, both friendly and enemy. I've definitely had my share of weird spotting issues.