Were Grim Hammers improved with the new rule set. I don't see many lists with Grim Hammers. I have a bunch I'd like to put to good use. Does anyone use Grim Hammers in a list that is decent?

They are quite good with Thror upgrade. Give it a try !

I haven't got the list itself but the last time I fought a Erebor list it had Grim Hammers as most of Thror's warband in the same way people have been using Hearth-guard with Durin. They didn't work as well but still made good shock troops. I think a 2/3 split of a warband with Grim Hammers and spears for Thror would be a good centerpiece to an army.

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"Draw your sword with a heavy heart, but swing it with a heavy hand"