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For leveling to be fun, imo there needs to be some kind of progression.
But CU will not be a PvE game with PvE content designed to stagger your progression to the top, and it sounds like there will be no battlegrounds either. As far as what I've read, I haven't read it all. A quick example of what I'm getting at, without PvE or battlegrounds, a new player would have no chance to progress in the frontiers.
Now imagine a new player joins a fully developed server, what sort of disadvantages are we talking about here? My first assumption is that progression would be a mix of side-grading and modest raw power advantage.
No matter how you do it though, I think we can all agree that:
1) New blood or recently rolled characters would need to be able to compete with the RR11s somehow, and still have a strong desire to progress their character in some specialized way.
2) That same RR11 felt very good about his progression from noob to awesome. That there is a clear uberfication in one way or another between noob and awesome, so that noob doesn't feel helpless, useless, and most importantly that the noob is still having fun and contributing in meaningful ways.
Itt this would be a good foundation principle article when you figure it out. :>