Quote from Krito;1189277:
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No, the joke is on people who use beam swords. It's usually the noobs who use them.
Beam swords are only alright if you have them reforged, but the chance is, you won't see many with reforged beams, and even when they are, they still probably won't do much damage.
Because of its absurd base damage and able for dual wield, it's only suitable for early-mid game human melee.
After that point, you're better off using battle swords or lances or 2h, even considering reforges.