The lightning is ok if you 6-slot it (although that can be said about most powers), Ball Lightning just plain sucks even with 6-slot which leaves Fences and the pet..
Electric Fences has a decent duration and aoe vs. mobs but against other players it just NEVER goes off! I have tested it and tested it, hoping for a decent Brute immobilization for annoying runners and out of roughly fifty tries (single slotted with Accuracy) it only caught another player ONCE. This could be a decent power (at least for Fiery Melee Brutes) but if its going to work that seldomly, I might as well buy Web Grenades in Siren's Call and use the power slot for something useful.
The pet is another thing that could have been a nice power but is not. He has to be 6 slotted to even begin to be useful, and 3 of those 6 need to be recharge timers otherwise you will hardly ever see him. Even 3 slotted, his damage and end drain take quite a while to have a noticable effect and by then the fight is generally over. Also is the fact that he dies very easily, forcing you to continually taunt your enemy and hope that he does not have taunt resistance. Lastly is the fact that you have to be level 47 and take TWO other Mu powers (only one of which is even worth considering) to summon him!
If the pet healed you (as the Dom pet is supposed to) or did some noticable damage/end drain to players then maybe it would be worth considering but as it is now, those power slots could go to other things that are vastly better.
So much for "stronger and more useful" PPP.