But, movies are half about our imagination. The best movies are those which invoke both our emotions and our imaginations. We need to be on a ride, we need to experience what is happening, if we were just watching and didn't feel connected, we would be totally bored by it.
I can see why you might want a satisfactory conclusion, as you want the film to be rounded off so that you can go away knowing what happened. What would you have liked to have happened....
Spoilers..... obviously...
I think though that no ending, where perhaps they didn't know which way to end the film is a better ending than just sugar coating everything as happens too often in movies. One of the best endings to a film that I've seen is in the film Right At Your Door, well perhaps not the best ending but the one that I found most shocking.
As for good movies, I'm now watching The Prestige, it's such a good movie, certainly amongst my favourites.