The episode III½.
So this is like a bridge between the original trilogy and the next three prequels. A story where the main characters from the original tale are not involved. Being a big fan of this franchise, I loved it. I did not expect big, so got entertained well. But pity that this wonderful characters are not going to return. This is just a one-off film. For seeing its overwhelming success, there could be a prequel, which has a very very slim chance.
The story was like that had started in a half way. That's why I wanted a prequel to tell us the Galen Erso's point of view story. When he has been taken back to the base to work for the Empire, his daughter is the only one who escapes from there. After a few years later the grown- up daughter, Jyn, end up on the rebel's side. When she hints a plan for them to strike the Empire, nobody considers it. But a rogue gang forms where they all does according to her saying. That's the story, and how it all ends are the rest.
The story was simple, but the action-adventures were good. Like what a 'Star Wars' fans want to see. The main drawback was there's no familiar faces around. Even the original franchise style of title and credit presentation was off the beat. Though there were cameos. Darth Vade, Princess Leia, R2D2 and 3PO, including a small lightsabre fight at the end, just to satisfy the fanboys. Overall a worthy film, otherwise it would have not earned one billion at the box office, making one of the top 10 of all time.