I upgraded the wrench so it was so ultimate, it froze the enemies and healed me when I hit them with it, such a farce, never needed to use anything else.
I actually beat two big daddies to death with it, one had me trapped in the respawner so I came out, wrenched it once, got killed, respawned, INSTANTLY hit it with the wrench and died, then repeated that like 20 times.