Mine is nothing like this, the display is gorgeous.
There is also an element of BS to that website, if you mouse over their over their scary image of oversharpening you see: "(the picture is not from the G3 - it is just for illustration of the effect)".
Another gem from picture 3: "LG’s G3 (compared against the Galaxy S5) has a big and super-sharp, 5.5” display, but it’s a screen that’s hard to read outdoors - it’s dim and reflective, so you’d need to stare with an extra effort to read it correctly". It's so biased I wonder if they had even handled a G3 when they had written that. It is not dim and reflective and you don't have to stare lol.
Maybe some one saw some content that was not compatible with QHD and didn't like the way it looked, who knows. I feel this is a great phone and my M8 is still in the closet until I can sell it. And one of the primary reasons is that after being spoiled by the QHD display it's difficult to use the M8.
I'm really wondering how they made this article. I mean, yeah oversharpening is a thing, but I don't notice it myself except in very, very specific instances (my crossword app is one). As for the dimness... did they just leave the autobrightness on and forget? Sure it's not super duper bright in daytime, but I can use it absolutely no problem.