Does your Dad say why he won't let you buy Guild Wars? That's weird. Video games aren't really harmful.
On the question of similarity to WOW, I never played that game but from what I've heard ... no, Guild Wars is not that much like it. I guess someone who has played WOW could tell you in what ways they are similar, but Guild Wars is very recent and solves many of the problems that the older games have been complained about.
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