I suggest not worrying about duel wield until you are able to reach 150 skill in double attack. The offhand is almost negligible until then! The only exception is if you are able to put a handy utility proc in that hand (I think this is why you see a fair number of people running around with polished granite tomahawks in their offhand at low level).
Once you hit 150 double attack the off hand has good potential, but it quickly starts to taper off a little again as it doesn't benefit from the damage bonus that the primary hand is starting to accrue.
That, combined with the availability and value pricing of 2handers for rangers probably explains why many rangers will forgoe dual wield entirely until they have their epics.
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