I'm well aware that I'm in the minority in disliking Johns' GL. The whole thing comes off as a fanboy love letter to Hal Jordan, which is just not something I'm interested in. I also think the idea of an emotional spectrum is stupid, and I'm disappointed that Johns is shoehorning it into everything he can, even stuff that's not related to Green Lantern (like completely changing Rainbow Girl's powers to match the emotional spectrum). As of right now, I'm perfectly content to stick with Green Lantern Corps, which actually preserves and continues the traditional GL concepts I knew and loved, and ignore Johns' retcon-happy GL.
I think you've touched on something that could perhaps explain why some like Geoff Johns, and others don't.
It seems to me, like Geoff Johns is very good at attracting new readers, making things accessible for them. Back in 2005, when I got back into DC after something of a hiatus from active comic-reading (and before that I was more into Marvel), it was Johns' work on "The Flash" that got me into that character. The way he developed Zoom, the Rogues, and Wally himself really impressed me, and while previously I was mainly just interested in Batman, Johns really showed me that the wider DC Universe was chock full of compelling characters and storylines. But I saw quite a few of the more longtime Flash readers criticise Johns as a inferior successor to Mark Waid, and say Waid had a much firmer grasp of good storytelling than Johns could hope for.
Similarly, I really got into the hype for "Infinite Crisis", and overall I loved it. But many of the people who had been around for "Crisis on Infinite Earths", spoke of "Infinite Crisis" as a pale shadow of a sequel.
And now, with "Green Lantern", it seems like a whole new generation of GL readers jumped on-board from "Rebirth" forward, making the title one of the highest-selling in DC. These new readers certainly love Johns' writing, and his direction for the GL mythos. But at the same time, a lot of the more longtime readers, the ones around for the Kyle Rayner era, seem to have a strong dislike for Johns and his retcon-happy approach to "Green Lantern".
Perhaps it's the very thing that makes Johns so appealing to new readers that makes him resented by older ones? Namely, his fondness for "starting fresh", and building up his own new "mythologies" for the characters. While this is great for newer readers like myself, who can jump on and feel like the title's accessible rather than that they've missed the boat, I can totally see how more longtime readers would be pissed off at having some of their favourite stories from previous writers overlooked or even retconned.