To me the interesting part is blaming this on plotting, why I’m digging into it is that - as writers/creators/dramaturgs we often coalesce around how it’s never what is happening, but how the people dealing with it interact with each other.
What plot events do you feel were missing? We had nukes, monsters, gun fights, h2h combat, robots, all the main characters interact. What plot point, if added, would’ve saved it for you?