Took out my KV-2 yesterday and had a few awful battles, but on the right map and right situation, you can have epic games.
I had 5 kills, 2.7k damage. Got the last kill too, and damn it was fun! I often have 1-4 kill games and still lose, so when you finally get an epic game and win, it can be absolutely amazing.
Keep grinding. Get your crews trained up. You’ll get better as you play as well. 1 awesome game can make your day and eliminate the feeling of a few mediocre/bad games.