Hmmm...
As everyone can see, there is obviously a big issue with the Lord of the Rings movies. I've read all three main LOTR books, and The Hobbit. Yes, they do change some things, but in general, it doesn't seem like they change that much. The paths of the dead are definitely different, but, I can't really blame them. Imagine, recording a bunch of guys walking through a passage for about however many minutes, and then finding a door with a dead guy hanging on it, and then calling up the army and having it follow you automatically.
Even so, I don't see why the inaccuracies such as would bother you so much. The movies don't imply that the book is wrong or anything. It's more like listening to a kinnd of altered version that is still good. Also, even if specifics are missing/changed, the army movement is about 95% correct.
So, I think the movies
1. Are ,as most book-movies, not completely accurate to the book
2. Good despite inaccuracies
3. Would be too long if absolutely everything was included. I mean, each movie is already about 3 hours long. Imagine having EVERYTHING put in!!!
If you feel otherwise then go ahead and present a counter argument. It would be more than welcome. (I'm good at debates)