The Polaris is a weapon that is looked down upon for many reasons.
In PvE, it disrupts the flow of the party with the random shock and knockback. People have gotten kicked for having it.
In PvP, the combination of speed, knockback, and AoE makes for a gun that is not suited to any PvP environment in any game.
Point is, most people don't like it in PvP, and most people don't like it in PvE. It is easily out-dps'ed in PvE, and allows unfair area denial in PvP with relation to other weapons.
Here is my suggestion (Both polaris and supernova)