I only read Steins; Gate and I am currently in episode 3 of Umineko no Naku Koro Ni- that's all in this year so far, since I have many other dwellings than VN's (video games, books, school, electric guitar, mandatory daily procrastination, etc.)
Umineko is like a weird rollercoaster of feelings: I feel somewhat "dislodged" when I read it: I do not know what to think and the game makes you feel many things back-to-back: Happiness, relief immediately followed by fear, disgust and anger. I quite like it.