I've started to notice something quite odd about the KV1 recently - it seems fairly well balanced. I just thought I'd bring this to Relic's attention so they can either make it ridiculously good or completely worthless with an upcoming patch.
All joking aside though, I don't see a ton of KV1s around. The only doc it's in off the top of my head is Counterattack, which I've mainly been using for it's B4. But it's a nice resilient medium that has a non-trivial chance of deflecting shreks, and can soak up good damage. It synergises quite well with Jacksons if you want a USF player as a partner in team games. Should the tank be in more doctrines?
I noticed its synergy with Jacksons earlier in a 4v4, while the KV1's gun isn't that impressive having 2 of these sat in front of 3/4 Jacksons makes it a real pain to get at the jacksons.