I just played through the final battle with Zaitan on an old alt that skipped this story step (most of my alts have). I wanted to get this step done with once and for all because this char's story journal is messed up. Recently I used a level up to 80 when PoF came out and played through the personal story on a new character (not this one) and became re-familiarized with the story . I asked in LFG for a group but no one joined so I soloed it. With our advanced specializations, we can, but that is not the point of my post. I remember people were upset that we did not personally attack Zaitan and just stood at cannons. We did not see or care that the choices we made in the story enabled our defeat of him. Solo. I was actually more aware of what we were doing in the instance and paid more attention to what the NPCs were saying. Now knowing what has happened since has made the ending of the core personal story very poignant.
Haters will always post something negative in response, but I challenge you to do what I did.