Aaahhh, Katawa Shoujo. Playing it for the first time is the only experience that I wish I could recreate. Got Shizune's bad ending the first time I played. Whoops.
And Umineko is definitely worth it, even though it's really slow to start and it took me about 60 hours to complete the first half. The first 4 episodes are the murders, and the last 4 show the truth behind how they were all carried out. If you choose to read it, make sure you get the PS3 patch because the original art is atrocious in comparison to the PS3 sprites. And it includes voices and CGs as well and most of the CGs are really violent.