You have it wrong. World first is irrelevant. It is the speed record that counts. 118 hours within 3 weeks of the launch is the record. Considering half of the PS crowd claims to have beaten that, let's see.
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If you can only attack 1-3 mobs at a time instead of 1-20 on retail then it is harder. Other leveling aspects such as quests needed to level and travel time is longer. Mobs are harder.