[2022] Hannover might be the worst ship I have ever played

You're kidding, right?
Hannover is super fun if you like secondary-build battleships. Stay at mid-long range and charge up your "F-meter" for when you trap something within your maximum secondary range and then watch them melt. You're one of (if not THE) tankiest thing in the game, so playing like a super-GK will get you an impressive game almost every time.

Oh yeah - they are not easy to play. I agree with you there. Easy to play are the USN and IJN BB lines. Those are very straight-forward in how they play.

Germans are more difficult as they do different things, so I agree with you. I really like the German play style so the Hannover is the logical conclusion of that for me