*nod*
those are combinations that work well when you are in a party with others. In beta its been a little different because of the limited people and advanced jobs. I am a 25 WHM with a 12 War Sub right now. In a mature server I'd be laughed at because with War as a sub I hold no bonuses that help me as a whm in a party (like extra MP, extra MND/SPIRIT), because in a pt I am no where near the front line.. I stand as far back as I can and still heal.. that way if the monster targets me, a warrior can taunt the monster away from me before I take a hit. I like the combo because I'm not a 2 hit Taru (as they call us) with War my defense is boosted and I have added hp, so I can take a beating and still heal ( I can take about 5 or 6 good hits, so gives people plenty of time to pull the monster away). However the more people you have playing, the more picky people get with combos.

example: A Paladin has amazing defence and good hp so they are a great tank... now suppose you sub whm so you have more mp and better spells. It works, but with all this hp and defence you want to be a human punching bag... this is hard to do when you can't pull a monster off of someone because A) you can't hit hard enough, and B) you can't taunt because you didn't sub Warrior. Therefor, people will pass you up for someone that has War subbed, or a War with PLD subbed...

Don't know if that helps, but you'll understand once you get in the game... its very political.. and you'd be surprised how quickly a reputation is developed... play nice and you'll be a king among men... screw people over and you will find the game a very cold and scary place.