The first time I read The Simarillion was when I was about 15, after having read LOTR a few times. It was one of the most moving, powerful stories I had ever read, and remains so to this day. While I consider LOTR to be the most complete and refined of Tolkien's works, I hold The Silmarillion to be his masterpiece, the most expressive and beautiful of all the works he crafted. In all my years of studying fictional writing and epic stories there are few that can compare to the scope and the depth of what Tolkien envisioned.
However, because of that massive scale, I think it would be too great to turn into a movie. The Children of Hurin alone would be a massive media undertaking, The Silmarillion would just be way too much.
Hey that's about the age I was when I first read it and the feelings of it being a masterpiece are shared. I did have some trouble with the beinging the first time I read it but it just made me read it a bit slower to make sure I really understood it. I'll always love Lord of the Rings but the Silmarillion slightly nudges the number one book spot from it for me.
As to a movie of it. I don't think they could make a movie and have it do justice to the whole thing. They could try to do just segments like the Children of Hurin or Beren but to try and show it all a once would be overwelming and too long of a movie in my opinion. as far as the right i'm sure eventually somebody will get them. money seems to always win in the end when it comes to movies.