dissipation shield/QP is not unbalanced. It can be annoying if you don't have any offense in your deck but that doesnt make it overpowered. I've crushed it many times with my firefly queen deck and my phase dragon deck wipes it out before it even gets started.

If you get a lousy starting hand against it, it might outlast your deck, but it can still be beat. Then again most any other deck will just flat out defeat you. And, BTW, if you know you're going to lose there's always the menu button at the top that quits the game and you can start a new one.