I'm a well read grad student who's bluntly honest about all things, although I try to be most honest about myself.
Both are superpowered, both have no lives outside where they work, and both have been abandoned in some ways. While Vision is more clear headed, and has the strength to ask why - and get answers that while not quite satisfactory do explain what happened - Dearborn is dying. And the company that he sold his life to? Well, they're going to let him die, because of how they turned him superpowered.
He's far from happy, and willing to take down every bit of Roxxon to do so. Meanwhile, Vision gets more and more uncomfortable with how much he sees himself in Dearborn. He sees a man consumed, a man who has but one thing in his life, and how easily the betrayal consumes him.
And while the Avengers aren't Roxxon, how much will it take to get him to break if he perceives a betrayal? Can he live only to put what the Avengers want, and need, above his own wants and needs?
It's very clever how this character study is done in comparison and contrast. The Vision could easily be Arthur Dearborn, and because of that, it's easy to use Arthur as a distorted mirror and to help Vision see what he truly needs to do. Which is, by the way, what his friends have been telling him to do in the first place.
It's a bittersweet story, but I loved the way Vision's character was explored in this. It makes me want to read more about him. I think I will in the near future.