It really depends on your playstyle. They can be useful however, especially in a Tempest Rush build since you have more spirit regen with a slower 2-hander.
If you do not like slow attacks, or use a lot of Life on Hit, then it would not be as viable as using two 1-handers.
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If you do not like slow attacks, or use a lot of Life on Hit, then it would not be as viable as using two 1-handers.