I get what you mean, I used to feel that way too. Though, I think Beaker has made his peace with the situation, he seems to like working with Bunsen. I mean, why else would he stick around? Though his attempts to get into the Electric Mayhem may have been a whim that he could never satisfy, I think he's generally okay with his job and his outlook on life is generally optimistic. You know, if he weren't a piece of foam.