I've got Portalius Wrath. Have used it a bit and it is definitely an interesting weapon, but it is also quite frustrating to use... not a precision weapon, but that's not the point, right?
The ability to put a torrent of quite large "bullets" bouncing around corners can be useful, but if you're used to taking out enemies with your primary when face to face so to say, it's pretty bad.
Big shots block your line of sight and damage is not top notch. A stand in for the regular Primary function, such as a fast firing BackUp or Sniper is recommended as a complement.
That said, it may be effective, or at least quite stressing and annoying, when used under the right circumstances! Sort of "spawn trapping" from far away, or perhaps "softening" the enemy from around a corner before attacking in earnest.
Put an Energy Mod on there and get "Piercing Shells" for maximum effect. Then it's a piercing ricochet weapon, with extra damage! ;-)