For more details about how good/bad the Pool Power attacks truly are see: https://forums.homecomingservers.com/topic/2223-the-problem-with-pool-powers/?tab=comments#comment-17116
The conclusions from that thread is that Pool Power attacks generally aren't very good, but as Mastermind primary attacks aren't very good either, it's all relative.
I'm no expert but if I were really keen for a fighting Mastermind I might for for Force Fields with a melee based pets like Nercomancy.
Force Fields give you decent defence which you will want if you are plan to get up close. If you only take the shields you should have power slots, Endurance and free time to engage in melee. Personal Force Field to save your skin when you get too much aggro. Meanwhile the zombies are well protected in their bubble and can self-heal, making them pretty self-sufficient. The Lich even provides a good amount of control. And if you get Life Drain you also have a means to heal yourself.
In practice I suspect trying to get yourself into the right position to engage in melee while keeping an eye on six or seven pets isn't always going to feel particularly smooth or effective in play but, it's a game right?
If on the other hand you just want to feel you are doing as much damage as your minions, I'd go with Storm.