
So now that this has been Taboo'd, how good is it?
The answer is still very good - what's changed is that the maximum damage per round for a fully invested hammer has dropped to 7 damage (2+2+3) from 9 damage (3+3+3). 7 damage for a full round of attacks is still great. It still interacts with Enchant weapon for the same effect. It still has no ammo issues, it still only costs 10XP for the set.
What this taboo did do was give Lightning Gun a place in the meta again, as the 3/3/3 damage option.
This still requires a lot less overall deck-investment to make good than M1918 BAR, Lightning Gun, or even Chainsaw and with the nerf is probably at the level of a Contrabanded Chicago Typewriter for raw damage output, but has the benefit over the typewriter of being much easier to succeed with.
Did this taboo go far enough? I think it did, in the sense that it's no longer clearly the best 2-handed weapon available for any investigator that can take it. But I can also see the argument that, even if it's not clearly the best, it's still got by far the highest floor of the big 2-handed weapons, since the exhaust is optional and it'll never run out of ammo.