I think the idea is that people who consider themselves "good" feminists have told the rest of us that we're not because we shave our legs / don't hate men / laugh at excessive rhetoric when we think it's funny / whatever today's sin is.

So this community says, "Fine, I'm not a *good* feminist. Now can I have real discussions about feminism and associated issues without you jumping all over me?" Seems like a worthy cause to me.