Dwarven Axe has lost it's shine. In the early life of the game, it was one of few attack boosting attachments, and even then you had dunedain mark, which is not restricted. Now there are so many other cards that get the job done better. Still, though; two for two on a Dwarf is a fair deal.
Attach to a hero. Restricted.
Attached hero gains +1 (+2 instead if attached hero is a Dwarf.)
Gimli, The Two Towers
Core Set #41. Tactics.
I just finished buying the first Mirkwood cycle, so for me is this axe still the best weapon attachment in the game so far. I use it only with the dwarfes and the difference it makes it's still visible. Very nice artwork, but still hope there's gonna be more weapon attachments coming. Verdict: 4/5.