Best obtainable weapon for a BM hunter. Barrel-Blade Longrifle is better, but not everyone get's to do Doomwalker. Expect the price of the Longrifle to be high when the loot starts to drop not soulbound in 2.4.

3rd best by the way is Don Santos, so even if Wolfslayer has a low dropchance, it's still the easiest to get for a not so rich BM.