Geoff Johns wrote an extended era of Green Lantern comics that finally came to an end a few years into the "New 52" era, and he passed the baton to Robert Venditti, who followed the basic pattern Johns had set by having one major story arc after another. Lights Out was the first of them, and it set the tone for what readers could expect from Venditti. I for one chose to view it, and Venditti, as good, but not really my cup of tea.
By "major story arc," I mean that Johns, and subsequently Venditti, attempted to ratchet up the stakes of the existence of all those green rings. Johns did so by expanding the concept, so that there weren't just green rings, but yellow rings (actually, those already existed when he came around, so he merely had to repurpose them), red rings, violet rings (again, repurposed), blue rings, indigo rings, orange rings, and even white and black rings. (I can see where those looking in from the outside would deem all this as silly, but the logic is sound in-context.) Some of these rings were natural allies, some naturally opposed, and in that sense generally expanded the mythology of Green Lantern. Johns could get away with writing constantly about the mythology rather than anything those using one of these rings just...did with them, because he was the one who came up with all the ideas, and no doubt it was very easy to get caught up, once the ball got rolling, in the possibilities. By the time he left, Johns had sort of realized he needed to step back a little, and so he introduced a new Green Lantern who mostly focused on his own problems (Simon Baz, a Muslim who was confused as a terrorist before he got the ring).
But Venditti was no doubt auditioned on his ability to keep that ball rolling, and so that's exactly what he did. Lights Out posits that all those rings were possibly...a very, very bad thing. As in, using-them-actually-kind-of-hastens-the-end-of-the-universe kind of bad. And it's not even the villain (Relic) who alone believes this, but Venditti has it be the truth of the matter. Star Trek (in The Next Generation) once did an episode ("Forces of Nature") where the basic concept of warp drive was similarly inherently destructive. I get it, us being in the era of awareness that oil is a finite resource, but...That's just not something that's...fun? finding out about basic elements of how the good guys operate in your favorite fictional universes as kind of making them the bad guys. I don't object to adding a little sober reality to flights of fancy, but it also seems like it's something quite different, for Venditti, than what Johns was doing before him.
Venditti's main claim to fame before tackling Green Lantern was the third version of Valiant's X-O Manowar, in that franchise starting from scratch and was therefore in complete control. I personally think it was a mistake to tap him to replace Johns. But he was also perfectly in-line with the whole "New 52" era, which sought to create a fairly self-contained version of DC continuity, a line-wide Marvel Ultimates. Perhaps too wide. By the time "Futures End" came around, it became eminently clear that DC was comfortable envisioning the end of the story for all involved, which is of course exactly what ended up happening not long after, before the "Rebirth" era began, with a more expansive, unlimited feel to the line once again.
Meaning, all bets were off. Meaning, Venditti could do whatever the hell he wanted, including Lights Out, beginning with Lights Out. He would later pit the Green Lanterns against the New Gods, and then let Hal go full rogue, using a gauntlet rather than a ring, and by the time it should've been clear that Venditti wasn't really following the Johns template at all, but doing it his own way. Some will find it easy to appreciate, a nice break from Johns, a new flavor. Others, like me, will have a harder time, especially if they really liked the Johns flavor.