Happened to me recently with Fate/Zero but only because...
Yeah I wanted to get that off my chest. The point is, stories that don't end on a way that makes sense or provides closure depress me. I wasn't depressed at the end of Fullmetal Alchemist, The Walking Dead or Kara no Shoujo despite having a deeper attachment with them because they all ended on a satisfactory note. Yes it was sad that they were finished, the endings themselves sometimes being sad, but the experience was amazing from start to finish. Now that the experience was finished, I could move on. I think I'm beginning to understand on a personal level why ME3 was such a big controversy now.
All a learning experience though. Not everything I watch is going to have an ending I like.
EDIT: Fate/Stay Night remake coming out. Depression cured. I swear to god if they fuck up her character... ㅇㅅㅇ
the ending wasn't all that satisfactory. It just miffs me that an anime that was pretty damn good as a self-contained series had to meet the continuity obligations from its visual novel predecessor. The biggest gripe I have is that Sabre as a character didn't really go anywhere. Sure you could say the same for other characters but when you give so much screen-time to a character and begin to develop them, they better fucking fully develop. Okay, she got a verbal beat-down on ideology from Rider and began to doubt and self-examine but this introspection just left her in a state of melancholy and despair. Up to the very end Sabre still feels the same way she does ever since her meeting with Rider, hell, she feels even worse. It just really bugged me that her character is left hanging for Fate Stay/Night. I can't even turn to the VN or anime for some kind of closure because apparently she's completely different and isn't well-written. Ah well, time to move on.
All a learning experience though. Not everything I watch is going to have an ending I like.
EDIT: Fate/Stay Night remake coming out. Depression cured. I swear to god if they fuck up her character... ㅇㅅㅇ