Hello!
The T5 Soviet cruisers have a long-range, open-water playstyle. You might also call them "Glass cannons". They share a lot of similarities so I'll list them here: Pros:
Excellent Range
Excellent Ballistics (shell speed, flat arcs)
Strong AP damage / penetration
Good speed
Cons:
Paper-thin armor
Low HP
Relatively weak HE
These ships should be played at the longest range you can feasibly do so. Spam HE at the superstructure of Battleships to light fires, shoot AP when a cruiser or battleship gives you it's side (aim for upper-hull on BB's), and slap DD's around with your high-velocity HE rounds. A light breeze will citadel you, but Battleships with 380mm or higher guns will often overpen your citadel if you are broadside and not do that much damage. Play around with it and you'll see that the armor is weak in some situations and uber-troll in others .
They can be a lot of fun if you have good aim!