*My reply will contain spoilers.*
The special effects were good, but the plot of this movie was very disappointing.
There are numerous problems with the film, but here are my top 3 gripes:
1) "Diversity>Talent" was the motto when it came to actors and character development in this movie.
2) Considering Snoke was powerful enough to incapacitate Rey and levitate her using the force with little effort, he would have been more than capable of sensing the betrayal from Kylo Ren. It makes zero sense he did not sense the impending danger.
3) How Luke Skywalker was able to meditate & use the force to project his image to a far away battle and actually interact physically with Kylo Ren makes little sense.
I got my movie ticket for AU$13 so I felt the special effects covered that amount, but in terms of story the movie was really weak.