Movie review(ish) - "Rum Diary", the movie without an ending

So, the wife and I had purchased a couple of Groupons the other day.  A great deal on a movie and a drink at Alamo Drafthouse.  If you haven't been to one, treat yourself and go.  They're an awesome place to watch a movie.  So, we decided to see "Rum Diary".  You know, the new Johnny Depp deal from Hunter S. Thompson and blah, blah, blah.  It looked kind of funny so we decided that was the one.  Well, it was actually pretty good.  Depp and the other actors did a good job.  The story was just fine, lots of boozy acting and the funny parts were funny.  So, here's my part of the story.  I had a couple of drinks with my meal during the movie, so I really had to use the restroom.  I figured by the way the storyline was going that I might as well go because they hadn't even gotten to the big ending and that would probably take a while to unfold.  I came back a few minutes later and the movie was over.  I asked my wife, "well, what happened".  Her answer: "nothing".  They literally built the movie up to the ending and it was just...  meh, sorry.  What's more, after the not ending, it was the literal sail into the sunset and epilogue wording on the screen.  I can understand if you've told an actual story, then decide to say how your character finished their life.  In this instance, we're talking about a work of fiction, so this type of thing plays more like, "sorry, we ran out of time for the whole story, so this is how it ends".  The previews and advertisements should have said: "from the alcohol-addled mind of Hunter S. Thompson" and then I would have said, "Oh, I get it".

As it stands, I guess I just don't get a story without an ending.