I don't deny that there are unhealthy habits (playing WoW 24/7 is most definitely unhealthy for the mind and body). My thought is that at the same time : - No hobby is immune to leading to addictive patterns, (some are definitely more prone than others). - No hobby always lead to addictive patterns

So in my opinion, if you don't engage unhealthily in your hobby, there's really none that is better than an other. So, WoW, climbing, dancing, reading, commenting on HN, whatever is good for you, I don't think one is inherently better.