I’ve had massive success with poleaxes. Played a tournament Saturday where my unit of 10 Hearthguards took out two Morghast Harbingers on the hit rolls alone. The opponent brought them back and charged for a revenge attack, I lost one model, and they took the two out again doing 8 MW on the hit roll and cleaned up on the wound roll. That unit also took out 8 Khorne Bloodbound in a second matchup, and reduced a unit of 30 Daemonettes to 9 in a third (a turn after the unit cleaned up his Keeper of Secrets - 7 MW).
I cant speak to the success of the broadaxes, but I am not sad about my choice to equip poleaxes at all. By the end of the tournament, the consensus was that no body would attempt to charge the Hearthguard again unless absolutely necessary.