I just did an Elf Dark Hunter 1-20 and it was very disappointing.

It has several bugs and other issues.

bugs that I found that I still remember:
Bleed the Weak works with other imbues, so turning it on does not turn others off. it does piercing damage instead of bleed damage. it messed up damage lines, its damage appears over the rest of your damage, and can cause other items to space out into stacks rather than lines. it does not benefit from double strike/shot(so when you get a double hit, it still does single hit damage). it does not scale with ranged or melee power(does base damage with no scaling).

Lupine instincts has a few issues. it sometimes just doesnt work at all, resummoning pet doesnt fix it, logging out and back in seems to get it working again though. It doesnt find secret doors, just traps. It appears that either the wolf doesnt get your full skill, or it has a penalty(I am guessing it works like the other auto detects where it is at -4+)