| i personally like bst/nin for parties.
it's a great combo, and as others have mentioned it puts out some nice dmg..
for the lvl 15 scrolls for /nin i use them all the time in parties. either for pulling or whatever.. also the debuff effect works almost all the time.
my set PT setup of
rdm/blm
rdm/sam
blm/whm
drg/war
war/mnk
bst/nin
we put out very nice dmg. and 3x magic bursts are awesome..
we Distortion chain (Ice + Water) and Induration chain (Ice) a lot. so i'll use Huton: Ichi to debuff the Ice resist on the mob before we chain. then the dragoon busts out Vorpal Thrust, and our Warrior will use Raging Rush. or I'll use Rampage for either of the 2 chains. and watch the magic fly for that 3x burst 2x blizzard 2, and 1x Blizzaga 2 (we are only lvls 60 and 61)
when we freeze chain if i don't drop a huton compared to when i do. i notice almost a 100 pt MB difference on freeze. and i would say about a 20 pt difference on the Blizzard 2's
so /nin is my choice and it works great. 
The Little House of Pain
Mainjob: 65 Mnk / 37 War
Farming: 66 Bst / 37 Whm / 30 Nin
Other: 34 Drk / 25 Thf / 20 Brd |