We've all heard the horror stories about WoW. People dying from playing it too much, people pretty much ruining their lives over it. These things do happen but they really aren't that common.
WoW is indeed an addictive game, but it only really gets dangerously addictive if the person playing it has an addictive personality. If they weren't addicted to WoW, they'd be addicted to something else most likely.
World of Warcraft is very reliant on fighting, but the fighting is harmless, there are some abilities that cause blood to come from your enemy, but those are only certain abilities. There is barely any swearing, the only swear I've heard is "damn" and I can count the number of times that is said on my fingers. There is also something that I haven't seen any review mention and that's the addition of a "cash shop", a shop where you can buy stuff with real money. It's not game-changing stuff, instead it's just cosmetics and pets.
If you have an issue with your child talking or playing with strangers, steer very clear of this game, as this is a Massively Multiplayer Online Role Playing Game (MMORPG), there are millions of people playing the game, and there's even some content that forces you to play with other people (Dungeon Finder). A lot of the people on this game are very immature, and when you're in a main town, there is the addition of trade chat which you should turn off because people will say sexual remarks, swearing, etc, etc.
There is alcohol, but the only thing that happens is your screen gets blurry.