Some things, namely incursion groups, will invite pretty much all jobs.
For BCNMs and Delve II, paladins with aegis and/or ochain(both of which are much easier to get now than they were years ago) are called for. Skilled rune fencers with their ergon greatswords can practically solo everything after the rest of your group wipes provided their is enough time left.
Popular damage dealers include thf(for sata rudra's storm mega damage and TH), monk (mostly for Formless Strikes), Samurai, and ranger.
Bard, Corsair and Geomancer are all very desirable for the roles they can fill.
White mage is typically the only healer anyone will accept in most cases.
Red Mage and Scholar are widely used as stunners but can perform a wide variety of other tasks. For instance, I had a skilled red mage tanking high level BCNMs just as well as any paladin I've ever seen just the other day. That same red mage pretty much solo'd all the skirmish runs we did with little help from the rest of us.
Pet jobs are good for soloing/low manning as always.
I almost never see any ninjas, dragoons, or drks anymore, but those who are passionate about said jobs can gain entry anywhere if they really try. Dancers can pair Rudra's Storm with Climactic Flourish for a similar effect to thf's, and provide extra healing and support.
I wouldn't say to avoid any jobs. Just play with what you are passionate for, and if you do well people will notice. Don't be afraid to ask even if they aren't specially shouting for the jobs you play. Often times, they must choose between inviting you or continue desperately shouting and begging their linkshell for the specific setup they want.
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Galkaman wrote:
Kuwoobie will die crushed under the burden of his mediocrity.