quote "this is going to be a masterpiece" => how to interprete this kind of statement?

i wonder if its a cultural  thing, or an age thing.
is it a thing for Asian dramas? does this happend to US or European shows and movies as well?

i am seriously asking, coz i joined watching c-dramas 8 years ago, and i have discovered so many comments on youtube, on facebook, like, tons of watchers, people who are commenting, are praising certain shows or movies or dramas, and the darn funny thing is, that stuff is not even releaesed yet.

How come one can say it's a masterpiece if nobody has seen it outside of a trailer or a teaser?

i am a fan of tom cruise, been one since i was ten years old or so , and even then, i never said something like OMG he has a new movie, its a masterpiece. ( i mean, i could say, it must be a masterpiece, to express my wish and hope, that it is going to be great, but i dont know at that point, prior to release, right?)

a normal person (in my opinion) watches stuff first, and then says, its great or its boring.
but not before?

is it maybe a language thing? do i misunderstand all those millions of comments, i came across the last 8 years, do kids nowadays speak another kind of English (as a second or third language) than the one i learned, when i was young?

is it just.-...normal typical exaggeration of feverish fans nowadays?

help an middle aged lady , to understand this?

 autumn iris:

I think I do 'promoting' some dramas and movies of my favorite actors/novel/manga/anime adaptation/remake at times sometimes even before it was filming. I'm sure they will be great even before its actual release. But I'm dropping them if they're not good.

And sometimes even if it's not my favorite actors, if it looks promising I'll tell my friends passionately about any information I read/watch. Though I may not even watch it in the end (but my friends usually watch them all as long as I didn't tell my friends not to watch the drama).

For me, it's very common to promote my favorites. Though some younger generations do promote their favorites in much extreme ways. Ah, young bloods...

thanks for taking the time, to explain your thoughts on this to me!

actually, now that i am thinking about this again, i do remember, there was actually something akin similar in my teenager years. in the 90s, nearly every star wars fan was feverish for the prequels trilogy. like the anticipation was crazy, and it was the time before the internet. i bought any magazine (not that there were many in Germany, certainly not as much as there was in US, at the height of their american empire dream, post cold war, as america was the winner) that had tiny scrubs of information about the filming/ it. 

but even then, it was like,... well we did not just running around and proclaim in an astrological way / predict , it will be great, or its a masterpiece. 

we hoped, but now that i am writing this stuff down, i think, its a matter of both cultural, as well as language, and i am interpreting too much in that statement. 

germans are seldom prone to exaggeration, so that is certainly, since i am socialized by the german way, this sort of exaggeration comes across strange to me. 

and second, at least 80% of fans on the forums, are non english native speakers. probably those who write that statement are all non english native speakers, so language , cultural and youth.

that combination makes these statements ... feels off to me, but perfectly normal to young bloods :) 

i was raised to not be extreme in any way, both with my asian family, as well as german environment. that must be the reason, why its been so inexplainable to me.