If you are reading this, chances are high you are at least a casual fan of Star Wars. It comes with the territory. Let's assume you've come here to find out how good Rogue One is without reading spoilers. I think I can be of help.
To summarize the story briefly: Agents of the Rebellion seek out Jyn Erso, daughter of the Death Star's architect. They want to use her to gain access to information about that rumored, terrific weapon. When they find out that the Death Star is real, a group of soldiers tries to steal the blueprints to the space station in order to find a hidden vulnerability in the design. If this is not what you expected then...where have you been the last couple of years?