Looks like we need more explanations of DPS versus the Damage stat.
DPS is Damage Per Second. Weapons have a speed component that isn't displayed. In general, a slower weapon will have a lower DPS, but have a higher base damage. DPS comes into play when you are NOT using your abilities (spamming normal attacks).
The higher your Damage stat the harder your abilities will hit. If you use a lot of abilities, a high base damage is better than a high DPS.
Hammer weapons are by design, slow swinging, high Damage weapons. Because of this, they have a lower base DPS. Don't judge only on the DPS
I hope that helps!
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