Any of the big heavy 2h/polearm weapons already suffer slow speeds and feats like "unbalanced " and that's all that's needed.
Fact is, using two hands and arms to wield a weapon is going to give you far more muscle behind the wielding of a weapon than using just one hand and arm, that combined with the fact that the common polearms and 2h weapons aren't as heavy as you'd imagine, means that it makes perfect sense for these weapons to not be retardedly slow.
Especially considering you have no shield and have to manually block with these weapons too, which puts you at a disadvantage vs any kind of ranged weapon and also when you are outnumbered by players who know what they're doing. I've played all builds and just went back to 1h + shield ( Getting ready for Strategus, if it comes back lol ) after playing 2h and polearms for the past 6 months or more and right now it feels like the most balanced it's ever been where mechanics are concerned.
