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.
That is an interesting point. File the movie not being enough a self contained story as another gripe some who are complaining that it is a rip-off of A New Hope are not finding to be enough like A New Hope have.