alright so heres my 2 cents after trolling a bit:
The LHB and Glaive in my experience are jack of all trade weapons. They can duel, work in a group, keep people at a distance, etc but they can't do any of these very well. If you want to duel, pick up a warspear, working as a group tends to be pike/high damage polearms, and there are longer weapons that can keep people at a distance.
They can't deal with shielders, they can't dehorse as well as other polearms, and they're cut damage so it'll take 4 hits or so to take out an armored tin can.
Length and speedwise, they are balanced based on their damage, which is cut and average.
LHB and Glaive ought to be secondary weapons for cav or range or a primary for an agile char. No one would pick the LHB and Glaive as their primary unless they like it specifically since there are plenty of other better polearms to use (pikes english bill, awlpike, GLA, GLB, German poleaxe, bec, etc etc).
In terms of spam, i've NEVER been spammed by a LHB/Glaive user unless they are an agil backpeddler. In that case i just say fuck it and pick on someone who wants to fight.