Excerpt from "'Should I Buy It?' - Red Death & Other Exotics" (Mar. 13th, 2015)
Knucklehead Radar is one of four Hunter helms, and is the only subclass-neutral Hunter helm. The main feature is a constant radar while using your Primary weapons; it's like having Third Eye for all your primaries. Since KR benefits Strength, the reduced melee cooldown fits in well. Lastly, more Super energy in PVE is always welcome.
This is a polarizing Exotic. Some Guardians swear by it, but many others consider it a weak Hunter Exotic. We lean toward the latter group. Generally the "best case scenario" for Knucklehead Radar is getting a slight drop on someone in PVP – aiming while strafing around a corner, watching your radar in anticipation.
If you really feel like you get overwhelmed or ambushed by enemies too often, give it a shot. Otherwise, we'd recommend looking elsewhere. There are simply better choices available.