No matter how many times Ock may say he's putting his old self behind him, it bothers the heck out of him that anything awesome he does now will be credited to Peter Parker. Or Spider-Man. Not Otto Octavius or Doctor Octopus.
That bit in the Horizon lab, combined with the whole "I GET TO WIN" bit at the end was so very... VERY in-character. And realistic. The epiphany in ASM #700 was real. As was the one in Avenging SM #15.1. But people don't do a complete 180-degree turnaround at the drop of a hat.
I think Otto's desire to be a hero is sincere, even if it's for the wrong reasons. I like that he's actually effective -- his "Master Planner" methods are different from Peter's, but they do work. But the narcissism is still there, the anger issues, the ego issues, the rage, the selfishness... he's still Otto Octavius.