I'm an ex-FFXI addict and would love to see a more open-world experience, but it would have to be balanced with instanced fields such as Guild-Wars when "zoning" brings you to a field where you and your party have exclusive rights...
No one likes to get KS'ed on rare monsters, and with PSO that's a pretty important part. Map waypoints for instant travel would be nice, and would solve the annoyance of the lobbies that in my opinion plagued PSU's game flow.
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