The key to balancing PvP is to completely divorce it from PvE. The day all skills function differently in PvP from how they do in PvE is the day an MMO will truly be able to "balance" both (or as close as one can ever get to true "balance").
Regarding Rift, I've actually seen a rather wide variety of classes whilst dungeoning. The thing about that MMO, though, is that most people have 2, 3, or more roles set up that they switch between depending on any given situation (and in a raiding environment, often from fight to fight). It's extremely uncommon for a player to ONLY be a 61 pt Purifier and nothing else.
Regarding Rift, I've actually seen a rather wide variety of classes whilst dungeoning. The thing about that MMO, though, is that most people have 2, 3, or more roles set up that they switch between depending on any given situation (and in a raiding environment, often from fight to fight). It's extremely uncommon for a player to ONLY be a 61 pt Purifier and nothing else.
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