There is no ideal fansite, IMO. But what I like to see in a site is creativity; something I don't see anywhere else. A lot of sites on the web have the same exact images, fanfics, and fan art.
I think it's made a little harder when a series has been around - and as popular - as ReBoot has. So many sites have come and gone. But yes; a site that puts its own particular spin on things is far more likely to get repeat visitors if it's original, updated often, and uses original material. It takes a lot of work, too. But something like that is worth it
-A.