I’ll explain as a mere guest what is the first impression I get as I check your forum.
I’ll explain how hard or easy it was for me to create an account. If I got confused or something didn’t work as it should, etc.
What does your main logo tells me. What is working and what isn’t in my opinion about it. How to enhance it.
Is it easy to find the menu to my control panel and other areas pages?
Do they blend with the theme?
It your forum division helping or is it damaging by being over simple or over complicated?
Is your forum needing them? re they confusing your users? Are they well written?
How easy is to find the team members and visually understand those that are part of the staff/
I’ll try to check the ratio between registered members and posts, try to explore if members get scared before posting or just in their first languages, see if the forum at hand has any purging politics, etc.
Do you have more staff than active members? How active are they and how involved are they with the community?
here I’ll post a personal message regarding the community and restate that this is just opinion from anotehr member which I hope you find useful one way or another.