I swear, PA is garbage. She has same problem as Omniknight: One item takes away one of her skills that she needs to survive and she becomes pretty much useless, To make up for that you have to use more inventory slots on survivability, and maybe, just maybe, it will work. Otherwise she just gets outcarried by anyone else that has an MKB or Silver Edge. 99% you are pretty much forced to get BKB.
Her early-mid game is decent, but not "push and end it in 20 minutes" decent. She isn't going to outcarry anyone. It also doesn't help that BKB makes her unable to jump on someone, although that one isn't as big of a deal since you can jump on teammates or creeps.
She's a frustrating hero to play as. I was picking her for the "Deal 500 or more physical damage in one attack" challenge, but after a few games of the same story, I realized I'm wasting my time and could just pick Ember, BH, Tusk (as a core), or literally any carry that Daedalus is acceptable on.