The reason for the “prequels” was George Lucas was looking to fulfill the life story of Anakin Skywalker, which..... was the character for whom the original SW series was based upon. Lucas had outlines for the first six movies written before he chose to start with episode 4. He felt it made the best translation to the screen and wasn’t even sure the series would even take off like it did.
Everything outside of Episode 1-6 was an attempt to expand on the SW universe, but for some crazy reason there was this need to keep most of the original characters in the plot lines to sell the public on it.
A little late on this, but Lucas actually had Star Wars plotted out as 3 separate trilogies. One for Anakin, one for Luke, and then the 3rd installment that we are seeing now has had some artistic changes. I want to say that they kept the main story line together somewhat, but I think that there might have been changes to where Rey is a nobody, as opposed to being related to the Skywalkers (originally, I believe the last trilogy had something where Luke has a child (although forbidden by the Jedi).
I think that there are two wrongs to Star Wars - the obvious one is because 4/5/6 was done in the late 70s/early 80s, some parts of it look a little hokey where the ships, fighting, guns, and light sabers all look like relics from a bygone era. The other issue is that I feel as if though there was too much trying to fire little one liners in for comedic relief. In the past films, some of the comedic relief was very well done (thinking of Solo and Leia in the Falcon during Empire Strikes Back when trapped in the asteroid).
It seems like some parts of the story were overrun by items that didnt make sense. Not trying to spoil, but the rebel spy in Kylo Ren's midst should have been seen using the force a long time ago. Things like that dont add up. If you can have a premonition based on the force, wouldn't that be easy to take the premonition and realize that person A is a spy or person B is near.