Yeah they need to destroy Hal's home town, kill everyone he knows and loves, and then have him possessed by and evil entity that makes him kill all of his coworkers. Then he might be an okay character.
Yeah, all that happened. But ever since he's came back, Hal hasn't seemed overly concerned about it. I think the fact that Parallax is an evil entity that removes their free will shouldn't totally become a "get out of jail free card" for them. Part of me would still like to see a little more of him being haunted by what he did.
But then again, on the other hand, the other part of me appreciates that a part of Hal's character is that he's not one to dwell on his emotions and insecurities, and is more about just manning up and getting on with it. I think Meltzer did a good job of portraying this, when he had all the heroes all plagued with dark thoughts in "Last Will and Testament", but Hal's just like "I live for stuff like this, bring it on!"
But all the same, I think some of the strongest characterisation of Hal in this volume came in the first issue of "Wanted: Hal Jordan", because we actually got to see some vulnerability, and chinks in his "Oh ho nothing bothers me!" armor. And as much as I dig the action-filled pace of "Green Lantern", it could benefit with giving the characterisation some room to breathe. Like, Hal is told Carol divorced her husband in the off-chance Hal might take her back, but then it's marching onto Sinestro Corps War. And when that's done, Sinestro tells him he still views Hal as one of his only friends and he still believes in the Green Lantern Corps, just as Hal has to tell him he is going to be executed. But then it's on with prelude to Blackest Night and Ginal Crisis.
One of the things I've really enjoyed with Green Lantern Corps is the downtime, the character moments. And as much as I'm loving Green Lantern, I think it could use a little more of those, perhaps in between "Rage of the Red Lanterns" and "Blackest Night". I think the welcome change of pace with "Secret Origins" was a good first step in doing this, though.