In the first two films the difference is stark. In the chess scene that became a meme, he is practically the only one of the 3 who sounds credible and makes the audience think that his character is really in danger. Rupert managed to make the audience feel that Ron wasn't a basic Mary Sue from the first film and that's why his character ends up not seeming as “magical” as the other two.
While the other actors had the writers on their side, he managed to save the character with the little he was given. If Daniel or Emma had played Ron they would hardly have achieved such a feat.
No one remembers that Harry shouted at Hermione being influenced by the horcrux but to this day many hate Ron for the same reason precisely because of Rupert's excellent work.
In the last 3 films, while Harry and Hermione seemed to become more and more fictional characters from a non-existent world, Ron became more and more a “real” character, which ended up making many people think that he wasn't on the same level as the other two.
There's a scene in Half-Blood Prince where he changes his face from total insecurity to the most confident guy in the world and another where he changes from a guy in love to someone who didn't know where he was that I highly doubt any other actor would have done so perfectly.
I have no intention of despising the other actors with this post, I'm just emphasizing the fact that perhaps Rupert's performance was too mature for the target audience who expected to see more heroic and flawless characters than realistic ones.
Did Voldemort’s inner circle know about his horcruxes?
Rereading the series and when Dobby shows up in CoS’ intro, he’s working for the Malfoy family and hurts himself whenever he goes against his Masters’ wishes, or reveals information about them, or disparages them.
That being said, Dobby warns Harry against going back to Hogwarts because of the “plot” against him. Then it comes to Harry mentioning that Dumbledore is powerful, etc, and we get this line from Dobby…
“Albus Dumbledore is the greatest headmaster Hogwarts has ever had. Dobby knows it, sir. Dobby has heard Dumbledore’s powers rival those of He-Who-Must-Not-Be-Named at the height of his strength. But, sir — Dobby’s voice dropped to an urgent whisper — “there are powers Dumbledore doesn’t . . . powers no decent wizard . . .”
This kind of alludes to what we all know as the incredibly evil horcruxes mentioned in books 6 & 7.
I know Voldemort would probably not even trust his inner circle with the knowledge of his Horcruxes existence, but could this possibly be referring to them?