Hear, hear! The attitude you describe is really common here and, I'm not saying people are wrong for being so technical/critical, but for me thinking like that really ruins my enjoyment of games. It's important to remember that GAF is a bubble of enthusiasts that is often not reflective of tastes in general.
Don't get me wrong, it's interesting to read Digital Foundry analysis or watch Matthewmetosis videos, but I wouldn't conflate them with subjective reviews of a game's quality or enjoyment. Like you said, if you're sitting around counting frames in every scene of Witcher 3 as opposed to immersing yourself in the lore and scenery then, IMO you're dong it wrong.