Sorry you felt that way and I hope you enjoy the film one day, but funny thing is that a decent amount of people were pissed when they left ESB due to having so many things left up in the air. Not saying TFA is on par but just wanted to note that.
Well thank you for being a good sport and not forcing me to change my viewpoints. 😃
As for the Maz explaining the lightsaber, maybe not when the castle was being destroyed, but just somewhere. It should’ve been explained at some point in the story.