Okhotnik makes me think of what would happen if you asked a small group of six year old children to design a destroyer and they each tried to one-up each other.
Mouse: Well, maybe. She can do very well in random battles, earning you credits and medals galore. I found it an easy feat to get three or four kills per match, which made unleashing the Kraken not too much of a stretch. The problem is that she's reliant upon having a Captain with the right skill combination to truly play efficiently. This precludes her use as a comfortable trainer for all but the last few skill points (and you're completely out of luck if your skill choices don't gel with Okhotnik's needs) which sort of undermines the purpose of a premium ship. So your mileage will definitely vary. For me? I'd take her to farm achievements and Kraken medals.
Mouse: Her concealment value alone will make her a good choice for competitive environments, especially combined with her ability to deliver high alpha, opportunistic strikes with her guns. The only major downside is her lack of agility which makes her torpedo bait. She cannot compete with Gremyashchy (what can?) but for people looking to pad their win rates, Okhotnik is a good ship.
Lert: No. Too slow, too vulnerable to torpedo strikes, not agile enough. The only things she really has going for her is her stealth and initial alpha, which isn't enough in a competitive environment.
Mouse: Ha! No. Okhotnik was never built in steel.
Lert: This is a paper ship with no actual history behind her. She looks amazing though. If you're looking for historically significant ships, look elsewhere.
Mouse: Very yes. She's a party boat.
Lert: Yes. Alpha strike is fun. Driving odd ducks is fun. Ships with interesting playstyles are fun. Crushing battleships as they round the headland is fun. Okhotnik is fun.