.ws Domains - So Bad?

I’ve wondered for a long time why .ws domains are seen as “so crap” by a lot of webmasters. I mean, their not the best, but so what?
I noticed that a lot of good keyword domains aren’t registered, including lol.ws, lmao.ws, pearce.ws, and even xxxx.ws o.o
Why does nobody seem to want these domains, even though [...]