My BB is the USS New York. It's a Tier V, and I just found out today that if I use AP rounds, I can sink a cruiser in about 4 or 5 solid hits.
Yikes.
EDIT TO ADD: my preferred method of engaging is to fire one turret at a time. This way I can adjust my aiming point (as required) and then fire continually with turret after turret. This way, if the enemy suffers a critical hit, his repair teams will be put into overtime trying to manage with crisis after crisis.
At close range, however, I fire as fast as I can to blast the enemy out of the water as quickly as I can. I'm not made for close quarter battles, and I'll put range between me and them as best as I can if it comes to that.