World of Warcraft is THE most addicting game EVER, but doesn't completely take away your life until you start playing 5h+ a day. I personally have played it for over a year. When you first get WoW it seems really exciting, but as you continue pllaying I found it became quite tedious.
I recently stopped playing. Last year I was a complete nerd, had no friends, yet managed acheiving high A's in all my subjects. I noticed when I stopped playing as much my social skills improved and I even got a bf, but i'm now failing 2 subjects(0.o)
That said wow effects diff ppl in diff ways and you shouldn't go just on one person's expirience to decide if you want to play or not
Around the time I started playing, a man died for playing World of Warcraft for 72 hours strait without sleep, hydration, or nuetrition