Well, like all cultural trends... Attitudes change with time, and what was cool at the time may become a regret. I've met people with full sleeves that say its the worst thing you can do (in context).
You [someone] may be fine with it and yet it may severely limit your opportunities (or not, depending on your preferred line of work.)
I gotta' admit.. this one is cool: http://i271.photobucket.com/albums/jj125/Gizmojunk/sharktattoo.jpg
Well yeah of course, but still I can only speak for my self and how I think regarding tattoos, I would not get a tattoo just for the sake of getting tattoos nor for them being cool, but that is me and not everyone and in the end everyone will live with their own decisions. I could argue that it is not wise to tattoo your hands and neck (of course not your face either and so on) but that has to do with my current situation that it is not suitable in most professional situations but again in the end it is how people wish to live their life, a tattoo on your torso or arms will not likely affect your life in any negative way at all, from personal experience I've gotten laid more often because of my tattoos so I would argue that they are a good thing!
But you could go on and on and anolyse it. I say tattoos are cool if you want them get them, but perhaps reconsider if your first tattoo is on your forehead!