Top DD are DRK, DRG, SAM and WAR in no particular order.
What about MNK!?
What about RNG?
without a k.club, what about it;;?
without considering survivability, MNK/WAR with faith baghnakhs is probably the best non-relic DD. hasso's a huge deal though, so if not MNK/WAR it's whichever hasso DD can suck out enough stats from gear/JA/traits/WS. this is stipulating a situation where haste, ACC, and ATT get capped by buffs somehow. raw potential, i say MNK/WAR, but if not it's a math exercise among hasso DDs job abilities/traits and WSs.
considering survivability and actual buffs, it's all a toss-up. the 2h DD i most often see being competitive with my MNK (or outparsing my SAM or DRG) is WAR/SAM. why? tons of haste, native DA, berserk, and a good WS. it's really as simple as that. they have JA (bergressor) that make up for lack of buffs, high haste capability, and a big push forward from native DA.
that doesn't mean John DRK/SAM w/o apocalypse can't outparse me on all my jobs or the best non-relic WAR/SAM. maybe they know how to make up lack of buffs better than any of us, you don't know until the situation happens.
WAR is a dominant DD, but only once it gets very buffed. at lower levels, DRG (and PUP, ironically) outdamage WAR into the ground. it all varies by situation. WAR with good gear paying attention is a good addition to every party though.
if you want a "broken" DD, you have 3 options:
1) put in a lot of research, time, and gilmaking to get one of those high end jobs that only a few dozen players have (eg maximally geared lv5 relic samurai).
2) level samurai, and listen to the idiots who tell you your job is overpowered. be amazed at 75 when you meet people at 75 that do as much damage if not more than you, and regret choosing (2) b/c SAM isn't broken.
3) understand that there is not 1 broken DD that dominates everything in ffxi, and abandon hope.
(good advice: try a number of DDs and pick the one whose playstyle you enjoy most. all DDs can contribute a lot) Edited, Mar 2nd 2009 7:54pm by milich