Oh, for heaven's sake.
There is a great deal more to acting than just learning lines. (And, in an interesting quirk, Ben Affleck pointed out to Michael Bay that the entire premise of Armageddon was simply nonsense. On the other hand, he still took the role.) Anyone who says that shows their ignorance of what acting is all about. Is it the most noble profession out there? No; that's teaching, if the teacher's doing it right. On the other hand, a good actor does a lot of work, and it's just snobbishness to claim otherwise.
Screenwriting? That's hard work, too. For one thing, there's an awful lot of pressure to make things "more entertaining" and "more accessible." There are some pretty horrifying stories out there about executive meddling.
And, yes, the film industry--calling all films "Hollywood," or even all bad films "Hollywood" is pretty ignorant--is an industry. Yes, its intention is to make money. And yes, things get changed an awful lot of the time, not just from science or history but from source material as well. (I'm looking at you, League of Extraordinary Gentlemen and every film portrayal ever of Dracula or Frankenstein.) However, "don't believe anything you see in movies"? What nonsense! Take a look, for example, at the film Glory. Yes, there are some parts which got changed. However, practically all the main information is true. You can look it up. They even toned down a lot of the story, rather than embellished, because they didn't think people would believe the reality.
You also can't just blame movies, come to that. There's a lot of nonsense spread in books, even, sadly, in history books. How many of you learned about Washington cutting down the cherry tree? That was in textbooks for simply ages, but it was flat made up by a Washington biographer who did not in so many words do any research. I've had teachers (blessedly few of them) who contradicted the historical record because it didn't say what they thought it should.
Oh, sure. Everything that's wrong with everything is Hollywood's fault. It has nothing to do with an underfunded educational system, with parents who don't encourage their kids to read, with a society that puts more emphasis on popularity than intelligence. But Hollywood is much easier to blame.
Oh, and anyway, isn't a good story more important? Even people who should know better still argue that one.
"Now everyone was giving her that kind of look UFOlogists get when they suddenly say, 'Hey, if you shade your eyes you can see it is just a flock of geese after all.'"
"You can't erase icing."
"I can't believe it doesn't work! I found it on the internet, man!"