With the penetration of that T90 I would call it a bug. I don´t know much about modern vehicles but I would guess that it is not possible to penetrate it with 30mm autocanons, especially with that ammo.
At the moment there is a bug with all the T90 models, at least it is strongly indicated. I made a test with 14,5mm mg armed BTR, hitting those T90. Most of the time they take a "penetration through opening". After a while they´ll scare of the T90, forcing them to pop smoke and withdraw. In a worst case they even take a critical hit and cook off their ammo.
I read about it in the bfc forums but until now the problem seems not to be adressed that much.
Some players claim that it is a design flaw with the drivers vision port. But even if it was, it occures far to often for my taste. At least you don´t hear reports that T90 would be knocked out because of that in the media....and nowadays you wont left out an opportunity to taunt the russian military...
To the Tunguska in general: Using it regularly against ground targets is gamey/non realistic (except for some anectodes maybe). You would have to be very desperate to use such a specialist, expensive and fragile vehicle at the front. Often such vehicles cost more than a fully equipped MBT.
Yes they are very effective, due to their firerate but I guess there is a reason why there are so few of them in a formation. Don´t get me wrong. I constantly use them and their predecessors (shilka) but it is a misuse non the less.
I want to use more rocket based aa but in contrast to the spaa they can´t be used in ground combat if it comes to desperate times.
