I did read this book some 20-plus years ago when I was in High School, but memory being what it is, I didn't remember much about it. So I went into reading it a mostly blank slate. Be aware there are spoilers in this review. I'm assuming you also had to read it for school.
The book moves along quickly and is compelling enough, I suppose. It's told from the point of view of Nick Carraway, a neighbor-by chance- of the title character. I was struck early on in the story by how bland Carraway's character is. His storytelling is without passion, without emotion and flat.