The KV-1 is its own class. It's not a Medium Tank, but it's not a Heavy Tank, it's somewhere in between.
It's the scariest tank in the world in 1941.
As Ostheer in those TOW you have to fight this thing without shreks, without fausts and your only armour is a Stug-E and an early P-IV.
Really it is with the anti-panther, if you want to have a category for things that are too potent to be medium tanks but not heavy enough to be heavies. But whilst the Panther is AT, the KV-1 is Generalist and the KV8 AI
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The KV1 is a nice tank, I'd use it more if it was not just in the one doc.
It's not something you use to fight tanks with; you use it to take the lead, attract fire and drive off infantry so your SU-85s can kill their armour.
With that MG in the rear turret I feel like it is something I ought to just drive straight into the middle of the enemy and wreck stuff.
But you don't make it your only tank. IS2s, T34/85s and 152s (maybe) can be your only armour; the KV-1 really shines when backed up with T4.
If it helps, view it as a KV-8 with better AT and less good AI; you wouldn't use only KV8s, don't use only these