It's a nuisance ship no matter flavour you take.
Jakku Gunrunner - is just a cheap chassis with a multitude of bump/bomb/tractor array combos. As many have said the Intel Agent crew is a solid chocie. You could even use it as a scout with Targeting Synchroniser and Weapons Engineer.
Unkar Plutt - The Bumpmaster himself. He has fantastic area denial, he is a ship you throw into the fray and ruins your opponents plans. A mate of mine just made Top 8 at our Regionals using Unkar with BoShek. He BoShek'd a Ghost off the board with only 2 damage on it. Unkar Quaddy is an underestimated ship.
Sarco Planc - Eh. His ability isn't great, nor is his pilot skill value. The Ugly Duckling of the available pilots.
Zuvio - Is quite a good bomber once you get into the scrum. With Cad Bane and Bomblet he can perma-bomb. Or he can utilise his ability to spit out a Proxy Mine or Conner Net and proceed to Tractor Array a ship right onto it. Pattern Analyser is a must in both cases to allow for the reverse > barrel roll/Tractor Array procedure.