Many prisoners are allowed yard time and are able to play sports. Some prisons even have recreation rooms. it makes sense, to me, to allow prisoners to play world of warcraft if they so choose. However, they should not be forced to play against their own free will, that would be bad.
Non-violent political prisoners should be able to play online games. However, the Chinese situation wasn't using games as a privilege. Prisoners were forced to work during the day and then forced to play so guards could get game benefits. It wasn't a reward for good behavior, it was basically forced labor. If prisoners are able to earn rewards for good behavior, then games could be used as an incentive.
It might be a good idea to let prisoners play some games, like chess and other offline strategy games that work to pass the time and keep minds sharp, but World of Warcraft should not be allowed. World of Warcraft is an online multiplayer game, prisoners could communicate with those on the outside and plot things.
Were the prisoners forced to play the game or allowed to play the game? They are two different things. I hate video games so certainly would not want to be forced to play them. However, I am sure there are far worse forms of torture than playing video games while a prisoner.