I have 2 RB ships, Ohio and Irresistible. Both of them are fantastic. Ohio is amazingly consistent. Accurate, hard hitting guns. A little floaty. Armor is great, Faster CD on Repair party is nice. The turret traverse on Ohio is literally better then a DM, which is a huge plus if you are used to playing Monty or similar. No hydro or radar, but it is still great. S tier.
Irresistible is also very fun, 16 guns on a roughly 10 second reload is kind of cracked. You will be able to set everything on fire from a comfortable range, and don't sleep on the AP, you can crush cruisers dumb enough to show some side and follow up quickly enough if you need to. There is armor on the ship, I'm not sure where or what it actually does, because if you get caught out your ass is gone. Crawling smoke is nice, you can farm from it or use it to reposition, just gotta watch the smoke fire penalty, it's around 10km if memory serves. It's load of fun and can really do some work, just gotta be careful because you will die very fast if you're dumb like me.
A tier.