I would say the story was fully cooked for it's length. Every arc built towards a strong conclusion.Superior is one of the most egregious examples of "undercooking" an idea for a major comic book.
There was so much potential but it turned out to be Slott screaming at us that "nothing will ever be the same after this!" and every other character in the book taking stupid pills.
The story showed that Otto was capable of achieving things that were never thought possible for Peter and doing things he would never be capable of doing like killing. Then Slott turns the story on it's head and shows that Peter doesn't have or do those things because he is the Superior Spider-Man. There's something special about Peter where he's willing to make sacrifices that Otto wasn't whether it was due to logic or ego and that was something he would never be able to copy.