No, they don't derail the thread. They actually want to feel excited about something great, for once. They want to feel as though they can talk about it in peace, without being shouted down by the pedantic nit-picking of one or two audiophiles. There are special music forums around, for that kind of thing.
This forum is about Michael Jackson. Undoubtedly he looks glorious performing his iconic "Thriller" in HD/3D. People who were able to see it in such a limited time/limited theatre release can count themselves amongst the fortuitous elite, for sure.
You said it all in your last sentence. "Let's go back to picking Thriller 3D apart." I swear, across the MJ fandom, this thread is the only place where that is happening.