Alan Moore notoriously refuses to watch the film adaptations of his graphic novels.  His main rationale:

If a thing works well in one medium, in the medium that it has been
designed to work in, then the only possible point for wanting to
realize it on “multiple platforms,” as they say these days, is to make
a lot of money out of it.

Even if money were the sole motive behind the Watchmen movie, though, how does it follow that the result will be bad?  Adam Smith might retort, “It is not from the benevolence of the producer, the director, or the actor, that we expect our entertainment, but from their regard to their own interest.”

When I read further into the interview, though, I was pleasantly surprised by Moore’s equanimity in the face of what he sees as Hollywood’s bastardization of his work:

I’m reminded of the remark by, I think it was Raymond Chandler, where
he was asked about what he felt about having his books “ruined” by
Hollywood. And he led the questioner into his study and showed him all
the books there on the bookshelf, and said, Look–there they all are.
They’re all fine. They’re fine. They’re not ruined. They’re still
there. And I think that’s pretty much the attitude I take. If the books
are as good as I think they are, then they are the things that will
endure. And if the films are as bad as I think they are, then they are
the things that will not endure.

Personally, I think that Moore should have seen From Hell.  I suspect he should see Watchmen too.  I’ll know soon enough – midnight tonight, I’m there!