Constantine - I know it doesn't follow the comic book as well as people wanted, but it was pretty well done
Mr. & Mrs. Smith - It isn't a great movie, but it is a fun action comedy that is watchable whenever it pops up
i, Robot - This one always baffled me. Of course it doesn't match the "novel", the "novel" is collection of 9 short stories written over a period of a decade. It is a pretty solid action mystery movie that actually leverages a number of elements of the short stories and adds The Zeroth Law of Robotics that was hinted at in "The Evitable Conflict" (last short story in I, Robot) and expanded on in Robots and Empire.