What's wrong with the movies today is that there is an ever increasing need for them to justify themselves and to support the economy of people who help create them. That includes not only the cast and crew but also the writers, directors, distributors, make up men, computer artists, coaches... The list is endless.
The end result is always to be buts in the movie chairs in the theatres. To justify these costs of bigger, luxury seats and concession prices, the movies need to bigger with better effects that take advantage of the big screen and also have residual value in DVD (or On Demand) purchases.
The simple days when you only got one opportunity to see a film before you had to wait until it was shown again on network television (after it was cut and censored and made adjustable for television commercials) has been long over. It is rare that you'll see a cerebral, plot driven movie last on the big screen. Why? There is no money in it. However, you will see that movie made available later on for cable, DVD, or On Demand. It will still cost some money, but the medium and the need to put that on the big screen is much less.
In our ever increasing need to make technology bigger and better, we've actually begun to kill the motion picture industry and entertainment for cerebral entertainment. We now can get our bit of brain stimulation from our Kindles and buy books cheaper than ever. More people are reading because the price of literature has decreased and the access to books has increased. Now, if you want to get that good plot you can read it. Then if the story is good enough, someone will adapt it to the big screen or cable.
The other argument that can be made is that writers are more interested in making money than making a creative story. Think about it. When Dan Brown put out The DaVinci Code and when J.K. Rowling began to write Harry Potter books - people raced to read them without any thought of there being a movie. Why? The stories were new and interesting - the money that came from them was organically produced. The trend later became stories that were like Harry Potter and The DaVinci Code so the writers made money but the genre became saturated and uninteresting.
I hope this answers your question.