I haven't progressed much. I have finished episode 2, but I'm only planning to continue after I have finished writing my impression blog post of episode 1 and 2. Currently work and other obligations prevent me from finishing it. When it is finished, I will let you know.
No, the ending to Umineko is not disappointing. It's quite emotional. It's just that EP8 Manga version has revisions and improvements, thus making it seem disappointing compared to it.