Kiwifarms is a set of forums that was originally based around Christian Weston Chandler (a.k.a. Chris Chan), but has since expanded to be about pretty much every unfortunate individual who constantly makes a fool of themselves online.
Because of this premise, the site can be seen as being a part of that weird underbelly of the internet. It's not necessarily as horrible as you might think, though--most people there no longer believe it's funny to troll Chris Chan, and a lot of the time they're protective of him in a way. As I write this, many users there are currently mad that a couple of people have been extorting money out of Chris.
The site is pretty intuitive for anyone who's ever used a forum before, so as long as you know a little bit about lolcows, you should be able to use them just fine. Just spend a little bit of time getting to know the culture on there before you post because otherwise you might end up looking like a fool.
While this is arguably one of the weirder parts of the internet, I think most of the people on there understand that in a perfect world, their forums wouldn't exist. I think for the most part, it's better to have these forums so someone can chronicle the bat$#*! crazy antics of the people they focus on.
I think as long as you're willing to accept the culture there, you'll be fine. Otherwise you'll never really fit in and probably should give the site a wide birth.