One of the key reasons they can't fight in PVP or WoE is because they can fair a hell of a punch. =P Plus, their buffs are sexy. Instant resurrection, fairly decent instant cures, guaranteed dodge, spell deflection... It gets silly. xD Plus, they've got several debuffs that would be a pain if used on players. I kind of think they'd be over-powered on a PVP / WoE aspect without modification. =P
On the aspect of Kaina: With that high of an INT, it's really based on personal preference. o.o If you really abuse your skills - fight very quickly, fly-wing like, and not allow the natural SP regen to keep up - then it wouldn't hurt. D=
I personally ignore it on a normal server. xD Mostly because I like playing a support Soul Linker in a WoE situation where I have a fellow Soul Linker to work with. We act as almost sexier Priests when we're together. =D
So... Shorter version? Depends how heavily you use Esma. n_n It definitely doesn't hurt if it takes several blows to hit your target. Then again, unless you're dealing with an MVP and have a tank, you really shouldn't be dealing with anything that takes more than three blasts to kill. They'll fry you alive. xD Even with our buffs, they can't take too many hits. If you're getting attacked, you'll need every drop of SP you can get for Kaahi, so, in that case, it'd be very handy.
... Damn it! >< That wasn't shorter.
