Shamblers are an absolute joke, am I right? The fact that you would pretty much need to concentrate solely on those skills and maybe one other like Bramble Shield and that is it, pretty much guaruntees your partner will never want to play with you again.
Their range/damage is meaningless from what I have noticed, and you will most likely fall behind everyone else as people kite your worthless shamblers into towers.
I will give it another go next game and see what happens, maybe they are better since the update, but I remember this build being practically laughable.