In "The Minority Report" Anderton is fat, old and balding. He is a typical Dickian protagonist in that he is half-incompetent and unsure of himself. In the film he is played by Tom Cruise and is a superhuman (though, to be fair, he is a divorced drug addict).
In the short story two of the pre-cogs think Anderton will kill a General and one of them (the minority report) says that he will not; the fact that there is a minority report and that Anderton hears about the reports that drive the story. In Minority Report there is no actual minority report, the pre-cogs agree on what Anderton will do. The film is about the pre-cogs and pre-crime (or, rather, pre-muder) but they are not integral to the plot.
In the Dick version the minority report is explained and Anderton kills the General, realizing that he must. Pre-crime is affirmed, even in such complicated situations. In Spielberg's version Anderton says, no, I have free will, I don't have to kill you. The pre-cogs don't actually see the future and pre-crime is a bad thing. His boss commits suicide and the system is shut down.
Spielberg, et al took ideas from the source material and then attacked the premises and conclusions.
I haven't seen it recently enough to remember what Stromare did but I will admit that the movie looked stylish and cool and that the computers and optical recognition systems were fantastic (though, again, because Spielberg is who he is there was no actual bite to the ads because they were real; actual businesses paid money to look futuristic and cool).
I think Spielberg is a great technician, he is exceptionally proficient at what he does. I just hate what he does, what he wishes to present, the messages he wishes to share and promote.