The person you quoted gave a range of 60-80% speed, and you fixated on 60%. Calm down son, it's interfering with your ability to read.
Every one I've seen who has played with both 2 handers and one handers has ended up going with 2 handers, so they can't be too horrible. If anything, 2 handed melee looks a bit OP compared to other styles, but I don't think any one is complaining because it feels epic to impale some one on a claymore.
what people "feel" is irrelevant, numbers are all that matter even with a 0.8 speed factor then two handed weapons barely give a 60% dps increase over single sword., assuming they do twice the damage per hit.
A fully maxed out dual wielder tripple the dps of a sword and shield user. 60% damage increase versus 200% increase, it's not even a contest. the only problem with dual wielding is that having to constantly spamm both of your mouse button is gonna feel weird for most PC user, and being forced to do it 3 or 4 times per second could get old very quickly.