In this tale of a sort of virtual memory transplant from brain to brain, the main character steps into a situation that's a little more complicated than we're accustomed to. It's the good guys versus the bad guys but with a renegade bad guy in addition who's just as dangerous as anyone else. I'm not sure why that complication was necessary, but it's not the picture's big problem. The big problem is that the scriptwriters have decided the memory transplant is kind of imperfect, maybe even kind of temporary, and they manipulate the degree of its effectiveness in order to help drive the plot. Since there's no such thing as a brain-to-brain memory transplant, there's no way to disguise the ups and downs of the result as anything realistic rather than arbitrary manipulation of the plot and thus of the audience. As others have said, though, the film is watchable thanks to its other qualities.
