Dark Knight and Gunbreaker are both damage tanks but they are apples and oranges to each other. I like both of them. its the difference between a GCD focus and off GCD focus. The damage diff is like 5%. You're splitting hairs while I'm talking about job fantasy which square has stated is their priority. you can have your 5 percent. I like my bigass sword. and as far as damage goes, Tanks and healers are the bottom 40% of total damage to bosses. I'd guess that tanks are probably about 30 percent of that 40, so a 5 % dmg diff in 30 percent of the max damage done to a boss...its not even worth stating as an argument against Dark Knight. As far as the "less functional warrior" argument...idk warrior bores me to tears and I don't think it plays like Dark Knight at all. Warrior feels really safe to play at all levels. Dark Knight feels...less safe. The lack of excessive over self healing (which everyone hates apparently) gives Dark Knight an exciting razor's edge feeling while playing it. I think Gunbreaker skirts on that edge as well but not to the extreme that Dark Knight does.