Speaking as a non-gamer I thought the first one was a good film. Its influences are quite apparent and their is little originality thematically. However, its execution was competent and that saves it. The sequels fall into the sad cliche of apparently not trying and were lackluster and only passingly entertaining for spurts.
RE:4 could be a good film to revitalize the franchise and pump some fresh blood into it ala T:4 and BBegins.