It's my first post here, so hello everyone.

I think spearwall halberds are among the best units in the game. For example, Denmark has got swordstaff militia (kind of spearwall halberds) and outstanding obudshaer. I used 10 Obudshaer against an uber mongol full stack. Guard mode off, spearwall on, head-on attack. They took some casualties before reaching melee but after that those halberds really kicked mongol ass. Soon the remains of the mongol stack were running away. The best unit of obudshaer got 149 kills and most others got over 100 too. That was on hard difficulty, using the ProblemFixer. I can't wait to get to combat the mongols with these supermen.
I admit I do not have much experience with other spearwall-capable halberds like french voulgier (sp?) but I'd expect them to work the same way. I do not know how these units perform without the ProblemFixer either.

Regards, Guru