Oh let's see, thats quite the list, I don't give a shit that the title says most, here is the huge ass whiny list of weapons I hate.
Scimitars, they have phantom reach, hit for full damage at the first 20 degree of their swing, making the leftswing at close range nearly unblockable. Also annoyingly fast.
Glaive, long hafted blade, this goes for all polearms, but I seem to find these two the worst. Ridiculously fast swings, probably slower chamber time, but they swing a lot faster than a 2h of comparable speed. Also after you block these, they bounce back in a way that greatly resembles the chambering of a new attack. The difference is subtle, causing me to fail to spot a lot of double attacks.
2 directional polearms, mostly awlpike. When stabspammed these weapons are insanely fast, much faster than you would think if you look at their speed rating. Also these stabs never glance.
2h stabs, they are active for way too long, causing them to do damage when already retracting. Same goes for overheads, but thats less used.
Lances
Arrows
Bolts
Small blunt damage weapons. It's so ridiculous to get knocked down like 1/3 times by a weapon with the size of a banana.