I know what you mean. Though at least Mountains of the Moon is a distinctive enough title that it calls to mind a specific movie and I can remember what it is, even though I saw it years ago.
What most annoy me are those titles that not only obscure the plot, but are so trite and empty that they don't call to mind any image or mean anything at all. For example:
1. As Good as It Gets
2. Something's Gotta Give
To make matters more confusing, both of those star Jack Nicholson. But when someone mentions one of these, I just about have to check imdb to figure out if it's the one with Helen Hunt or the one with Diane Keaton. Conversely, if I'm already thinking of, say, the Diane Keaton one, all I can remember about the title is that it's some inane cliche.