I view RoboCop as sort of a prologue to Starship Troopers - we definitely see Verhoeven crafting his skills here, but this doesn't make it an amateur production - far from it. It's a basic story, which we've seen many times before - a cop, Alex Murphy, is almost killed by Clarence Bodicker, a bank robber with a foul mouth. We think he's dead - he is missing an arm, after all! He's revived by OCP, a mysterious corporation, who put him into a robotic body, the future in Law Enforcement.
RoboCop isn't just a mindless action film - the storyline of OCP wanting to raze Detroit and build it again, parallels the refurbishment of towns in the early '80s, who wanted to make it more sophisticated.
Overall, it's a nice change from the usual mindless action film, with nice hints of drama and satire. If you're looking for more, definitely see RoboCop 2, but you should probably skip number 3, where it all became a bit silly.