Well, that's totally subjective. I know a lot of people who'd completely disagree. What Johns did with Parallax makes much more sense than Hal just all of a sudden becoming a cackling, homicidal lunatic in like, five seconds.
In fact, I'm surprised it took someone as long as ten years to think of the Possession Angle as a way out of the cluster**** that was Emerald Twilight.
It may have made more sense in light of Emerald Twilight being ten issues too short, but it still was a shoe horned retcon that invalidated pretty much all of the character stuff Hal went through after ET. The story in of itself isn't bad, but in context it just makes Johns seem like a *****ey fanboy who only wants people to play with his toys on his rules.
Out of curiosity, why do you think the emotional spectrum is a ridiculous and stupid idea?
1: It humanized the GLC too much. One thing Green Lantern's usually been pretty good at was portraying aliens as actually being alien. You had the blind Green Lantern who called himself the F-Sharp Bell. You had Mogo, and GLs who were sentient viruses and math equations. The series recognized that life could develop in a way that wouldn't share the same experiences with us. But the emotional spectrum is based on the color spectrum that humans can see and emotions humans can feel. It doesn't acknowledge that there could be races that have different forms of cognition from us, and it ignores that there are other colors. For instance, X-Ray is a color. We can't see it because our eyes don't work that way, but it's a color. And we do know that there are races in the DCU that can see X-Ray. The entire concept of the Emotional Spectrum is incredibly human-centric in a setting that's supposed to be bigger than that.
2: The spectrum itself doesn't make a whole lot of sense. Why those seven emotions? Why are they the end-all-be-all of human experience? What about sadness? Or boredom? Or hell, happiness? Where the hell is happiness? They're not represented on the spectrum and they're all a big part of my life. Hell, willpower isn't even an emotion at all, it's a trait, but it's on there. And what about people who are really hopeful and really angry? Most people feel a lot of stuff in equal measure, and it shifts depending on the situation. They're can't be easily defined as just "hopeful" or "greedy." I'm reminded of Wonder Woman's commentary on the whole thing, "Life is more than just seven colors."
And then there's the issue with fear. With all of the colors, wether or not you're qualified to be a blue lantern or a green lantern or whatever is dependent on how much of whatever trait it is you have. Blue Lanterns are all really hopeful. Except for yellow. With yellow it's based on how much you make other people afraid. Why? Why is it different just for them? The out-of-universe reason is that the Sinestro Corps are supposed to be the bad guys and spreading fear is evil, but there's no decent in universe justification why they break pattern.
3: It contradicts the mythos of the GLC in a dumb way. Originally, it was always pretty heavily implied that the reason you need to have a lot of willpower to use a power ring is because shaping energy into three dimensional objects to do stuff for you solely with your mind is really hard and takes a lot of concentration. It was never intended to be that the rings are somehow "powered" by will like a battery. And now with the other rings, you have them being "powered" by rage, greed, or an "ability to instill great fear," and basically being able to do what the GL rings do. So they took and explanation as to how the rings work that kind of made sense and made it make less sense. If they made how the various rings work even more distinct, and gave them specific abilities that really only work if you have a lot of a specific trait, with green being the making of Constructs because that requires a lot of will and the powers of the other rings being based on their respective emotions, then it would work better, and they did that a little bit but not enough because most of the rings still just make constructs.
4: And this is I think the most subjective, but it hurts the tone of green lantern. GL always used to have this weird vaguely British 70s space opera feel to it, with weird aliens and locations and social/political allegories and a lot of imagination and wit. The Emotional Spectrum, however, feels a lot more new age sword and sorcery, which is just fine in of itself but clashes really badly with how Green Lantern's supposed to feel.
