No. I'm just saying that their opinion can't be taken as a fact. What professional experience I need except some common sense to see how ISR works and elaborates its facts?
First things first, it has to be said ISR is
the site and youtube channel dedicated to covering sim racing. If there's anyone qualified in the whole industry to compare racing games/sims it has to be them, because they are the only ones that have been doing so at such level for many years and that have experience across pretty much every single realistic racing game ever released, on consoles and on the PC. The GT series is not the only thing out there.
Now lets embed the latest video they made about GT6, uploaded just yesterday.
Would you say there's any misleading or elaborated fact in that video, or any unfair criticism to the update or to GT6 in general there? I wouldn't, because they are right. As much as people here liked the update it has to be said that the amount of content was clearly lacking for how much it was hyped (3 cars no tracks, no mclaren no interlagos); plus they talked about the announced updates in general and they are right in that there haven't been any of what was announced. Those are facts.
Also. what do you mean about how ISR "works"? Please be more concrete.
In this aspect the only thing that might be weird is that they are sponsored by iRacing, so it's doable to think they are biased therefore will trash other games. However, if you take a look at the iRacing subforum here in GTP it's very clear that people try that game and never go back to the GT series, as the former is superior quality-wise and racing is just better.
edit: Maybe another issue could be that they prefer the Forza series over GT. In this matter I suggest you to try Forza5 and compare it with GT6: it's clear that Forza5 is better in every single aspect you can imagine, including physics, car and track detail and whatnot aspect PD is so proud about, plus fixing all the issues GT6 has and more. Please watch the Nurburgring video I previously linked and tell us it isn't a fact that the Forza5 version is miles better. The only part in which that game was criticized was in amount of content, which they are now fixing with non-delayed huge patches that bring the game up to PS4 generation quality instead of using PS2 assets, but quality-wise it's the clear superior in everything. In other words, they like Forza5 better because.....well.....it's better.
As blunt as this might sound, they have that broader picture you probably do not. Quality-wise the GT series is not even the top5 anymore and in amount of "premium" content Forza4 still is in the lead.