To be honest the weapon effect dont need to be that strong.

They can be extremely basic such as giving primal weapons bonus elemental damage. Oh you have a Ifrit weapon. Your auto attacks deal a bonus 70 dmg as fire dmg. Its not a very strong effect, but it gives the weapon a more unique feel and you can do this many ways besides just giving more dmg. How about a buff to one of our traits lets say.... Heavier shot having a 25% chance instead of a 20%. Sure its only 5% but its still nice nonetheless.