You won't be winning any parses with PLD, but they're still welcome as a safety net in a lot of endgame stuff. If you do plan on using PLD as a "main", put some serious thought into making an Aegis if you haven't already.
As for other jobs you can use in the meantime, WAR (again, equipped in purely eminent gear) will do just fine for any farming activity you'd want to do, with the exception of certain hard-mode BCs. Also for your WAR, look up the Minos GAxe. It's not difficult to get- just requires some gil, and is regarded as one of (if not THE) best GAxe in the game.
If you feel so inclined to level another job just to gear the ones you care about, you can do so. However I'd argue that with the effort you'd put into leveling and gearing those to an "acceptable" level, you could have made equal strides on the jobs you care about by just using and farming with them.