Jacob St-Amour from Link-Cable Writes: “World of Warcraft, a game that is built on the foundations of having millions of players uniquely interact with one another has had many devoted fans over its long life span. From questing with Guidlies and or strangers, tackling dungeons and large raids, to the gauntlet that is PVP, many facets of the entire franchise were made specifically on the interaction from one player to the next. So what this statement may sound strange to say, but it is also true as ever since its inception. World of Warcraft can be considered as an amazing single-player experience and in some cases, also even better when playing by yourself rather than with others.”
Source: N4G PC World of Warcraft is a Great Single Player Experience