Good movie, but missing storyline depth

Rating: 7/10 (17 December 2015)

After seeing the (for me) most anticipated movie of this decade, I had mixed feelings. It was definitely a good movie, outscoring 1 & 2 by far (3 is somewhat on the same level if you ask me). But the major disappointment is the depth in the story, which for me a is big aspect of the Star Wars Saga.
An example (spoiler alert) is Kylo Ren, the son of (princess) Leia and Han Solo. It is obvious that he has fallen to the dark-side, but the untold mystery remains WHY? Of course his grandfather is Darth Vader, but that alone is not reason enough in my opinion. But according to the movie it is. Another example is Finn and the reason he turned his back to the First Order. After he saw a comrade die he was suddenly completely turned. Again the question WHY?
Next to that I expected the movie to be way darker, based on the trailers. This was also disappointing and I really felt (although this will be a clichÃ©) that there was a real Disney signature on the movie. They really tried to keep the Saga spirit and succeeded for 75%, but also missed some crucial points. For instance, Kylo Ren was never as 'frightening' as Darth Vader was from the first moment saw him.
Don't get me wrong, overall it was a highly enjoyable movie and it contained some great Star Wars elements (sometimes a bit too much copy), but I had expected a bit more...