I fail to see what is supposed to be so “different” about this movie.

The way I see it, it goes like this:

A group of Rebels is evacuating from their hidden base after being discovered by the Empire. They are not able to flee through the hyperspace because of technical difficulties.
A group of characters sets out to meet a scoundrel, who might be able to help them out. However, he turns them in to the Empire.
The protagonist from the last movie meets an exiled Jedi Master. After some hesitation the master agrees to teach her about the Force. She then encounters a reflection of herself in a dark cave and leaves before the training is complete.
The protagonist believes there is still good in the villain, so she turns herself over to him. He brings her to his master who reveals he was behind it all. He is about to kill the protagonist, but the villain turns on him and kills him.
The villain then invites the protagonist to help him bring new order to the galaxy, but the protagonist escapes.
Then there’s a battle with speeders and AT-ATs.
And the Jedi Master becomes one with the Force after delivering his final lesson.

My problem is that I think TESB and ROTJ did all of the above. It was admittedly a bit less flashy than this time around, but it was still more enjoyable.