Ranked feast is...

[Cynric]

snip

healers can solo carry out of lower ranks just fine right now. Melee can too(not samurai) if you can 100-0 the healer on the enemy team the moment they get CC'd since healers aren't taking defense. If they are just kill the ranged/melee/weaker player till their defense wears off. Ranged can too (not rdm, unsure of blm, seems like its tossup with them), tanks can too (not warrior).

Seeing the trend?

basically these jobs can carry out of low ranks up to high ranks easy.(some easier than others) based on my experience/opinion anyway

SCH/ WHM
PLD/DRK
MNK/DRG/NIN
SMN/BRD

if you play anything else you will have the hardest time laddering as there are so many problems on the other jobs that they can not function well enough with bad team mates in the current patch. Some of them look great on paper till you actually play them too.

of course it should go without saying that if you have a very bad healer or someone DC's you may as well just get ready for the next game.(and take note of their name to exploit their weakness later) A lot of healers seem to freak out and leave their team behind running away from a tank/melee and it's causing a lot of deaths that could be avoided otherwise. There really is a lot going on in this new mode. its not balanced, certain things are too punishing and some jobs literally can 0-100 in 3 seconds if they know how to play. There's currently a huge gap between a good player and an outstanding player due to the new system.