1) Main one - Separate stories more clearly. Maybe slightly outdent, enlarge, or bold the title, or add a little more space between stories so they don't all run together.
2) Some articles don't have content available for no apparent reason (Deciphering Mary Stuart’s lost letters from 1578-1584)
3) Filters would be nice (articles >rating, comment count, etc)
4) Collect a few more pages of articles instead of just one
1) I have increased the spacing between stories. Also, have you tried the Mobile view?
2) Looks like some websites are harder to parse than others. Some users have also reported similar issues with GitHub/Gists. Will investigate.
3) I've removed the rating for now. Will add filters to the roadmap.
4) I'm currently showing all 30 articles from the HN frontpage. Would you prefer fewer articles, but paginated?
For #4, I expected it work more like HN does, where it shows 30 articles but has a more button to get 31-60 and so on. At least 3 pages would be nice for those of us who keep reading past the first page.