There are not bad. They are cheap and have very good optics.
About the shilkas, I think it's a shame that they are so weak. It was a very good and accurate AA gun when it was first field and it was upgraded many times to keep it effective. I don't understand why he has lower range than the Vulcan since in every sources I read about them said that they have the same combat range ... and someone on the forum said that the M163 Pivad had only a air search radar, while the shilka has a targeting radar ... But the Pivad have 8 accuracy anyway
. Seriously, the AA shilkas should be upgraded to 1750 meters range and get +1 accuracy. The afghanisiki or whatever should be transformed in a real ground support vehicule like the Rarden. I would give it -1 accuracy to show that he no longer have a radar and give it +1 AP. Then it will become a specialised infantry support vehicule and the AA shilkas will be restored to their true glory!