Both the story and the solo gameplay are fun.
As for the reasons why I do not currently engage in most group content.
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PuGing into raids and mythic dungeons isn’t my idea of fun. I’ve seen enough Leeroys and jerks over the years.
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I just don’t have time to run with a guild at the moment. I have three children between the ages of 3 and 8 and my work schedule requires me to work on the evenings that most guilds run group content.