The only people who use this weapon are newbies that are using it as a crutch. For this reason, I think the weapon deserves some looking into.
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Problem 1) Pulsars are awful to play alongside in PvE
Say you're about to attack something and the bullet is coming. It may or may not knock the thing back based on if it's big or small when it hits and whether it freezes or shocks. You have to predict the impossible to land your attack, while the pulsar user.... spams attack.