the 2 handers that don't aren't used by anyone.
That's a problem, don't you agree? No weapon should be totally discarded. There should always be a reason to use any given weapon, otherwise why have it in the game?
You can get fast, light-hitting 1 handers.
You can get fast, light-hitting 2 handers.
You can get slow, heavy-hitting 1 handers.
You can get slow, heavy-hitting 2 handers.
On the whole, they do roughly equal DPS.
Only difference? 2 handers block shields/pots. So again, why would you use them? There needs to be a tradeoff for the loss of shield mods/pot chugging.