I'll tell you this: I'm not "really" a user here. So I think whatever I have to say is... decently valid.
I discovered this site looking through the gazillions of collections of beta sites that seemingly go on forever. When I first see a site, I look at some of the users, the highest voted questions and read their answers. I fell in love with this site at first glance.
I have an account here, yes. I don't build the world... Even though the old ones tell me "Oh, it's you young folks that will build the world of the future" (I'm 15 by the way). But I don't participate. I don't know if it's because I think my own ideas are stupid or something else, but I don't.
Quite frankly, I don't even know if I vote. Yep, I haven't even cast a single vote... :( Actually, this meta question is the first up vote I've ever cast, on meta and main. I just love reading answers to various questions, smiling and laughing throughout the process.
I love many answers with this site, that sometimes I get a few of my friends together that love writing and we read through the answers. The comments are the best. We love talking about it. They love the site as much as I do.
I'm curious: What do outside sites think of us? What is our reputation?
Also, how can we change any negative perceptions that may exist?
Reputation (That means something, oh... That's user reputation :P)... I think it's pretty good. I don't talk to much with a lot of "people" from the entire community, and I don't think I've ever seen it brought up. So I can't tell you what the SE community thinks of this.
However, students and teachers in my school love this site (Worldbuilding). It helps us with ideas, they provide us with inspiration for projects in and outside of school. Being referenced in schools is... A pretty darn amazing feat.
Negative reputation... Well there's nothing negative of this site. Yes, there's the odd question or answer here and out, but that's common with everything, just like any other site. Nobody minds this.
As an "outsider" (Don't think I'm one anymore...), this site is amazing, and I just have one thing to note (And yes, I'm smiling and "yelling" when I say this)...
Keep It Up! :D