WIS is complete junk. The only time it might be useful is if you grind from 50 to 60 in Living Tombs, as every thing there is undead. High ministation just reduces the power cost of our heals a bit. But as power is a nobrainer, this does not matter.
All other trees have their value:
- STR:
interrupt immunity
nice debuff
interrupt proc
some additional health
- AGI:
Shield Ally (great if speced right)
double attack
mezz
AE protection
- STA:
melee crit
heal crit
short stun
- INT:
casting haste
spell crit
short time fast cast group buff (very long recast)
long range spell (to pull)
All are nice. You must decide which 3 of them you want, as you can't take all 4. Most take STA all the time, but esp. if you don't go in to melee (As you only took 4 into melee crit by now, but actually, why not?) build without STA might be thinkable.
Currently I have a AGI / STA / INT build for grouping / OT group and a STR / STA / INT build for "the special encounters". Would love to have a third build for solo / dps group with a STR / AGI / STA mix.