I don't think I've ever outstabbed a longsworder with my poleaxe.
Depends on what you call outstabbing. In a realistic combat situation you have to take stab speed into account, not only stab length, because both players move. The poleaxe has a massive advantage here. High speed means you have the power to wait for your opponent's move and react accordingly.
On top of that, the poleaxe has more stab damage than the longsword which, considering heavy-ish armor, reduces the effective range of the longsword more than that of the poleaxe.
Polearms are by a huge margin the best weapons, and poleaxe amongst the best of the polearms. I see no reason to QQ tho: Poleaxe should be best weapon, it was pinnacle of european melee weapon technology. It really is the best and its ingame abilities reflect that: you get to rear horses, outrange 2handers, knockdown, give pike support, spam everyone. It's best because it really IS best. End of thread.
I think that's a good argument for expensive poleaxes, but I'd rather see its rendition changed to something less horribly spammy. Also, Glaive, GLA and GLB should definitely be unbalanced and slow as hell, I don't think there's even a debate about that.