The reason movies shouldn't be remade.

Most people, when they see a movie they like, they only remember the really good parts about the movie. That means that the people who made the original succeeded in making a good movie, because people remembered certain parts. They were especially successful in those parts.

So if you go about making a remake, and you're the typical Hollywood producer without a clue what art is, you pretty much just want to remake those parts of the movie that everyone remembers. Here's the problem: Those parts have already been made pretty much to perfection. If they hadn't been, then the original wouldn't have been successful or popular. There are a thousand ways to do a scene wrong, and about 2 or 3 to do it right. The odds that a remake will choose those iconic moments to remake --- and actually get them right? Not very good. Remakes are always worse than the original, unless of course the original didn't succeed in doing whatever it set out to do. If that's the case, as in The Incredible Hulk, then you are not doing a remake, you are doing a re-imagining.