This site seems great. I really like the removal of downvoting in favor of discourse, as it seems to work very well. However, I think there's some places where this site could be improved.
1. There should be a way to ignore subs.
Right now the site is designed around growing dialogue between differing opinions, however this is a little difficult to engage in due to the open-site nature of SaidIt. Certain content types such as the more "fun" sites can be distracting or annoying for people who want more engaging discussion. If someone wanted to come here to enjoy animal pictures and videos, or discuss communism, or talk about water, there would be the entirety of the site around them. I, personally, wouldn't want to see certain anime boards when I'm browsing. They just don't interest me, and the communities of those specific shows tend to be annoying to me. That doesn't mean I want them banned, or that I want to debate them for enjoying a show and wanting to talk about it. I just would rather not have to see it on my main page. Maybe this issue is tied to the fact that the main page appears to just be /s/all.
2. You should be able to resize embedded content.
This is definitely more of a personal preference, but when I click the little image expando, it's nice being able to resize it to better see it. Sometimes the images are bigger than my screen resolution, or a little too small to make out. The same goes with videos.
3. Subs should be able to pick whether they want "Insightful" or "Fun" to be the top voting system
Right now, all subs use Insightful for their top voting system to encourage discussions around insightful content. This is good, however some subs might want to be based around content that is more fun. If someone wants to make a meme board, or a board for cute animals, maybe they would want fun to be the encouraged voting method. It wouldn't have to change the voting weight, so that insightful content is still preferred through the site, but rather give mods the agency to encourage the content they want on their sub without disrupting the SaidIt ecosystem. Currently the system almost encourages mods to make a work-around.