This is poorly handled as well. Slott wants us to cheer for Ock. Why else would he compare him to characters like Jeff Winger? Jeff's a scumbag, but he's at least amusing and nowhere near the monster that Ock is. But Slott compares the two, because he wants fans of Jeff to say "oh yeah, Ock's kinda cool".
The accessing Peter's memories thing is a travesty. For one thing, living someone's life all at once would cause an irreparable mental breakdown. Ock wouldn't know what was real and what wasn't. It's too stupid for words.
Secondly, Peter Parker is dead now. That's it. He is gone. Not dead and will come back. He's gone. Regardless of a/theistic beliefs, a "soul" is generally considered the sum total of a person's individuality. Their desires, their history, their conscience, their reactions, all of that. That's what makes a person who they are. Ock has all of that. Peter doesn't exist any more. His soul has been raped and absorbed because Slott can't write. When Pete does return, it doesn't matter. Ock has all that makes Peter who he is. This is so much worse than the Ben Reilly fiasco because Ben was always a clone. Ock has all of Pete inside of Pete's body. There's nothing about Peter that is his any more. Nothing.
Dan Slott gave everything away because he wanted to write fanfiction.
Jeff was straight up evil, as far as Community goes (not crazy like Chang - evil), when it started. To the point that Evil Jeff is basically Jeff from episode one. Not that he's anywhere near as bad as Otto, but there's still a bit of a valid comparison there. Otto might learn something as it goes on, like Jeff did. As far as we know, this is only the beginning.
It kind of did, in a way. It broke down Doctor Octopus and created the Superior Spider-man, as far as his mindset goes.
But the Memory/Ghost Peter was Peter's "soul", essentially, just a part unaffected by the initial swipe. If Peter comes back, the part of him that comes back is probably going to be a third fragment of Peter's original brain, one that wasn't stuck in Otto's body or Memory/Ghost Peter. It would be Peter Parker.