Pretty grungy... on girls they look kinda butch. On guys I'm not sure, I think the soles are too thick, but I see them around a lot so if by "cool" you mean what a bunch of people are wearing right now then I guess so.
Obviously docs + jeans + flannel is going to look pretty butch but some girls look amazing in them. I wanted a pair but they're a little out of my price range.
Haha Doc Martens. I used to have a pair of shoes and a pair of boots when I was in like middle school or something. I haven't even heard about Doc Martens in years.