I've already trained myself to turn my tank with the turret in order to track targets. I also turn my front towards enemies in an open firefight so that they have to shoot at my most heavily armored area and it also helps prevent getting tracked.
I look forward to getting the bigger guns on the KV and turning it into a credit machine, since I'm sorely lacking credits since I just recently bought the KV (with 75% crew) and right before that I bought the VK3601 (also with upgraded crew) so that cost me right around 1.2M total.
You will LOVE the 107. You can penetrate IS-3s on the side with it reliably, and it is strong enough to scare most people. I consistently get at least 4 kills in games where I'm placed top tier, provided I don't get artied to death....
although I don't think the KV is indicative of most russian tanks. In fact, the KV is an anomaly of sorts because its so slow turning. The KV3 turret is agile, and the rest of the IS series are very nimble. I actually think american tanks are much more ponderous, and they need great thought put into location because their bottom hull and side turret armor are made out of hopes and good will.
I shot the rabbit ears on the t-34 a few times with my KV-3, did about 20% damage each time...
The IS-3... is mediocre. Driven one in beta, and its not terrible... but doesn't stand out much. The upgraded turret is ok if you're doing frontal firefights, but I believe the standard turret has a bit more armor on the sides. The 122 at that level does not cut it in fire fights, and the only redeeming factor for the is-3 is the BL-9, which costs a bundle to research. The costs on the tank is fairly high (1000 a round for either 122 or bl-9) and it will not make you money unless you go into uber mode.
Heck, i don't think the IS will make money unless you have premium. But then I used the 122 on the IS...