Yeah you have right, if someone doesn't want to read it it's fine, but this persone cannot give a feedback or a review of a comic a movie ecc by only reading 5 pages
They can, because that's how it works in the real world.
If you release your own entertainment media, anyone can totally give a review or feedback based on portions of what they watched or read.
This is especially if your work is up to be rated by anyone, such as the "Like/Dislike" system in YouTube.
Someone watching a movie can just walk out of the theater halfway if they think the show is boring and not worth watching the rest.
Nobody can force these people to watch the rest of the movie.
I should also remind you, online services like Steam, PSN & XBL also allows users to rate a game just by owning them (some only for digital purchases).
Someone can give a 1 star rating just by playing the first hour of a game.
Sometimes, the starting of a game can leave a bad impression on the player, resulting in them having enough.
Why?
Because this is just how the world works.
If any of you have problems with someone giving a negative review for a media they didn't fully experience, then you can go ahead and implement a law or system that verifies someone has finished watching a movie or playing a game before they can "rightfully" give feedback.
It's easier said than done.
Like it or not, this is the reality.
Go ahead and release your own entertainment media and force everyone to only give feedback after they finish experiencing it.
You'll accumulate a reputation of being an overly-defensive, whiny person quickly.
have a conversation whit another person
That's not what we're talking about at all.
We're not discussing about "knowing enough to have a conversation about it".
We're talking about how anyone can watch only a portion of a media and give a negative feedback about it, because everyone has the freedom to do so.