Dunkerque is a very useful ship. Her 330mm armament is very effective on her bows and her ability to fire at opponents with all guns without turning is particularly useful. This means that she does not have to expose her side to torpedoes. her speed is also worth a mention, being the fastest Battleship at tier 6. However her classification as a battleship is, like the Hood, Inaccurate because she is a battlecruiser. she also retains the Quad 330mm Armament. which should she be caught by a heavy ship from behind, is a death blow unless they get within range of the 130mm Secondary Armament, Which against Anything other than a destroyer, Is Hopeless.
Claiming it's still the fastest t6 BB is no longer accurate. Normandie has an equal speed.