I really like the look of Forest Wraith as a bonus on some classes, just be careful how much of your damage is a class ability.
Forest Wraith adding 2037 (9.3% crit, approx) wont apply to light attacks, set procs (like a monster set), stampede etc. If you're able to get as high as 70% class damage it'd offer you up 6.5% crit approximately as a 5 set bonus, or 1426.
Compare this to Orders Wrath, which offers you 943 crit chance as a 5 piece on TOP of the 8% crit damage.
I think you should consider going Orders Wrath and Back-Alley Gourmand instead. Together that's:
3571 crit (16.3%)
258 dmg
21% crit dmg
So, assuming you're running Major Prophecy and Thief you'd be doing crits of:
Crit Chance:
3571 from sets
2629 from buff
2190 baseline crit (which is the 10% shown on your sheet)
1533 from 7 piece light armor (219 per piece)
Total: 9923, or 45.3% crit.
DW daggers makes this 1632 higher, or 52.7%. A Staff would make it about the same because of trait.
Crit Damage:
50% base
10% barbed trap or other minor force source
21% set bonus
10% class passive
8% fighting finesse (since you're not building for trials where it might be overkill)
total: 99% crit damage.
Assuming full divines:
Now if you added Thief mundus stone, you'd add 2167 crit (9.9%)
If you added Shadow mundus stone, you'd add 17% crit dmg
So you could go with 61.5% crit / 99% crit damage, or 52.5% crit / 116% crit damage.
Thief is a 1.609 damage multiplifer (baseline of 100% damage, 61.5% chance to do 99% extra on a hit)
Shadow is a 1.609 damage multiplier, but has the caveat of wasted bonuses from chilled, if you wore wading kilt, major force via aggressive horn etc.
Obviously you're free to use Forest Wraith if you fancy it - but I think Back Alley with Orders Wrath for everyday fighting just looks so tempting to combine.