IS-8 is a Soviet heavy tank of tier 9 with good cannon, pretty good speed and no armor at all. That is why it is usually not being left in ones hangar and considered only as intermediate vehicle. In fact it is just a fast tank destroyer with a turret and appropriate style of playing.

In general it is a weak and annoying tank, but if you want to get to IS-7, than you will have to suffer.

Cons – lack of satisfactory armor.  Pros – good cannon and speed.