There were many high points for me, and this speaks well for the show. I must admit, however, seeing Luke Skywalker cleaning house with the Force and his laser sword was a definite high point. If I had to pick one moment? That was it.
His movements were so clean and precise, weren't they? He truly has matured into a Jedi Master after confronting Vader and destroying the Emperor. He was everything I believe a Jedi should represent in the finale.