The mancleaver is good. The long bardiche is even better. Compared to the axes, it is a bit too good. Very long, okay speed and very high damage. Lower swing damage by 2 points and balance would be restored IMO.
The Great Long Axe was over-nerfed a few patches ago, but that shouldn't be a reason to nerf the Long Bardiche, a weapon that is already a novelty. I just traded for a Mighty Long Bardiche; would you rather I conform and get a loomed Bec like everyone else? The Bec does more damage than GLB, GLA, LB, Flamberge etc on chain and above (i.e. everyone but archers and peasants, who would be 1-shot regardless).
Personally, I think there is a place for short, slow, hits-like-a-truck cut weapons in both 2H and pole; the axes should fit this role (raise axe damage by 2-3 across the board). The Bardiches should do a little less damage, since they are longer. However, don't get there by nerfing the bardiches, just buff the axes.