I don't really remember MI3, because I didn't get an undistracted viewing of it, but I think MI4 is pretty entertaining, very much a descendant of the TV series, with its own bag of tricks and twists. MI4 is really nicely done, I thought.
Agreed. If you haven't seen Mission Impossible: Ghost Protocol, I highly recommend it. I'd rank it as one of the best action movies ever made, alongside Die Hard, Speed, & The Terminator.
As for the problems with the 1st Mission Impossible movie, IIRC, isn't that the only one that doesn't have some kind of Star Trek connection?

Absolute Power is a passable thriller but very different from the book in that the Clint Eastwood character is killed off quickly near the start of the book and it’s about his daughter and em... someone who helps her (it’s been a while).
I read William Goldman's memoir Which Lie Did I Tell? where he talks about how adapting the screenplay for Absolute Power was such a pain in the ass. (It's a fun book. You should give it a try.)
The main thing I remember about the Damnation Alley movie is that it was one more example of Paul Winfield's characters always getting killed. I remember a Starlog article about Winfield that was specifically about how he was known for getting killed a lot, with Damnation Alley and The Wrath of Khan being two of the main examples.
Don't forget Anthony Zerbe. He always gets killed too, in fact in worse ways than Winfield did (Licence to Kill, anyone?).
Did Zerbe's character die in The Matrix Revolutions? I don't remember.
Annie is a great crowd-pleaser Broadway musical. It is also, in presenting the New Deal as a happy ending, the political antithesis of the very conservative original comic strip, which I understand was extremely anti-FDR. Which presents an interesting question: I love Annie, or at least I did as a child when I saw it twice on Broadway--but is it ethical to present an adaptation whose message directly opposes that of its original source? I mean, if the original strip had been pro-New Deal but the play presented it as a terrible thing, I'd probably have been annoyed.
I don't think it's unethical. Creativity is a dialogue between different creators' works. Every work, original or adapted, builds on ideas from earlier works, sometimes by reinforcing them and sometimes by challenging or refuting them. It isn't the job of an adaptation to be a slavish imitation of the source; the job of an adaptation is to be a response to the source, an interpretation and modification of it as the next step in the cultural conversation that it's a part of. It's not supposed to copy the original creator's voice, but to re-express the ideas in someone else's voice and thereby add to the dialogue.
And sometimes that means that adaptations critique the ideas and attitudes of the original, or even repudiate them. Heinlein's Starship Troopers is more or less an endorsement of military fascism, or at least a thought experiment examining how it might be beneficial to society; but Verhoeven's Starship Troopers is a biting satire and deconstruction of military fascism. Between them, they offer two sides of the issue, and that's arguably more valuable than if they both just parroted the same take on it.
Then again, I can certainly see how a creator who had a certain point of view behind one's creation might be offended to see it subverted to represent an opposing point of view. From that perspective, it could be seen as inappropriate -- that's not what my characters stand for, so use your own characters instead! I probably wouldn't be as philosophical about it if someone did it with one of my own creations.
If it's an intentional subversion of the ideology of the source material, that's one thing. That's legitimate. Verhoeven's Starship Troopers is a deliberate counterpoint to Heinlein's Starship Troopers. But since I doubt Annie was aiming for that level of postmodern critical depth, I would classify it as an inappropriate, disingenuous perversion of the original creator's intentions.
In a similar vein, I felt from the beginning that Zack Snyder was an inappropriate choice to direct Watchmen. I don't think a filmmaker could adapt both Frank Miller and Alan Moore and be faithful to the underlying worldviews of both. As a result, the Watchmen movie focused more on fetishizing the violence than exploring the world-building that Moore accomplished in his original graphic novel.
Would Conan Doyle have approved of turning Dr. Watson into a Asian woman? Who knows? But he's dead and past caring so where's the harm?
It's not about ethics. They're just stories.
Arthur Conan Doyle was past caring what other writers did to Sherlock Holmes even when he was still alive.
Generally, you can shrug it off and say, "They're just stories." But what about when the story has a specific political or ideological agenda? What if someone did a pro-big government adaptation of Atlas Shrugged or The Moon Is a Harsh Mistress? Or a pro-war version of All Quiet on the Western Front?
One of Verhoeven's "problems" as a director of these action-oriented movies that he intends as satire (Robocop and arguably Total Recall, for instance) is that he's too good at the violence, and a big segment of the audience just eats that up at face value. He does often present it as comic.
Reminds me of A Clockwork Orange. That's another movie where so many viewers just responded to the violence and never seemed to realize that the story was a satire.