I think the sites content is fine, it's all pinball and I love it, even with the few serial posters. They generate discussion and keep the site ticking along when others don't have much to say.
The thing is, that it's hard to come up with new original topics for discussion, there is only so much you can say about pinball before you start repeating yourself.
If you don't think a thread will interest you then don't read it, very simple.
There are many, many posts that I don't read as I'm just not that interested in the topic.

I think the layout of the site could be a little better though.
Sometimes it's hard to find where to post much less find a thread you might be looking for.

I agree with some other comments, it would be good to see more tech related threads and more restos but I'm just happy there are any at all.
 
More smileys :)