Murm honestly just needs to be nerfed, it's ridiculous. Don't think I've played a game where a Murm has appeared and hasn't got at least 4-5 kills against bigger, badder ships and its AA is just ridiculous. Rarely see one below half health either because their armour is pretty good for their tier too.
I realise it's Russian so they'll make it retardly strong, but come on now, this is just silly. I honestly wonder what they're gonna do when they bring in the pretend Russian fleet of propaganda they're planning. Tier 7 could probably oneshot a Yamato.