Beside that, they kept the basic premise and characters faithful, did they not?
In the first one, yes. But as I said, things went to hell rapidly in the sequels. As soon as they killed off Marie, there was really no chance of remaining true to even the central focuses anymore, and it only got worse from there.
Just like the X-men movies created and established their own continuity, they had to run with it without being slavish to the text.
The reason the latest Harry Potter movies are so excellent is because they are REAL MOVIES that aren't worried about being slavish to the text. The first two did that and they really don't hold up. But the last 3 while aren't word for word translations of JK Rowling, do a great job of movies by themselves. And Rowling doesn't seem to be complaining (cept maybe about her paper cuts counting all that money).
All of these are way closer to the books than anything in the Bourne series.
If the X-Men movies were called "X-Men" but... at the end of the first movie, Xavier was killed off, and then at the start of the second, Cyclops and Jean and Storm were killed off, and then the series was just about Wolverine fighting new, made-up villians like Fan-Man who can cause intense gusts of air that can press you against a wall... while he got increasingly more cuddly and friendly instead of staying a gruff badass... oh wait, that last part actually happened... well anyway, that would be more like what the Bourne movies have done.
Or in the case of Harry Potter, if Harry had remained a callow, innocent youth who continues to be dumbfounded by magic even in the fifth movie, and of course he's the only lead because Hermione and Ron were killed off at the start of Chamber of Secrets, and he spends most of the series fighting, say, Sirius Black? That would be more like the Bourne movies.
Really, I'm just amazed. I'm a very open and forgiving person when it comes to source material translations. Yes, I liked
The Bourne Identity, it's pretty wicked. I respected how much they changed
The Lost World. I actually enjoyed the first
Resident Evil for keeping the same basic themes and the same universe and the same conflicts, even if everything else was changed. But I have never known a film that has diverted so intensely from its source material as the
Bourne sequels do. The filmmakers are the first to boast that they just used the books' titles, then made up completely different stories with completely different characters doing completely unrelated things. That's not something to brag about. It's just madness. At that point, why are you making movies with this brand name and these characters on it? Why not just go off and do your own thing instead? It's not like you couldn't warp the novels into something more modern. You already did it once.
Casino Royale did it. Instead, you wuss out and slap those familiar with the character in the face with your dick.