And I don't understand how anyone could like Spiderman.
Anyways, to be entirely serious. I loved LIT, it's a love it or hate it film, but honestly, why completely bash it? It's not a horrible film at all if people somewhere are getting something out of it. Maybe because I can side with one of the characters and feel their feelings that I'm able to get into it. Plus I love Japan as well, so I'm humored throughout the film.
A movie is not crap because you cannot get into it. A movie is only crap when, it simply does not achieve its goal at any point for any person. Not even I label a movie as crap when I don't like it and someone else does. That's just silly.
Anyways, to the original subject, depressing? I can't say I feel depressed at any time throughout the film. The ending is very uplifting I think because you have to realize, rather they want to stay together, they will always remember each other. It was a chance meeting and worked out well. You don't forget these kinds of people you interact with. There are some people in my life, that I barely got to spend time with or talk to, that I still remember to this day. They brought an emotion in me that I've never felt before, almost a very swept off my feet kind of feeling. I nearly fell in love with that person. This is why I enjoy the film so much, it touches my heart. We have to remember that movies can't always be understood and loved by something that's on paper. You can't always like a movie for a set formula or for an exact reason. A lot of films are driven by emotion that are targeted at certain people. Take a gay themed film for instance. If I were to have, someone watch... Soldier's Girl or many people. Some may dislike with reasons that it's boring, the acting doesn't quite portray reality to an extent or it's over emotional. But someone who can feel and know the characters is going to love it. LIT is the same case.
You can't always judge film by your own feeling, or by a text book of examples. It often just comes down to who you are, which is really the basis of all opinions. Nothing is worthless because you don't like or understand the love for something. Nothing in this world is truely overrated either. It doesn't take much thought at all to understand why someone else would love such a film.