The same critisism you give here was already given in the LTC announcement thread . LTC was simply copy-paste etc etc. Look where the coin is now.
LTC is different enough from Bitcoin to warrant interest. A different hash algorithm which is expensive to calculate with an ASIC and signigicantly faster transaction times. This gave miners reasons to believe in it and it quickly became the number 2 cryptocurrency, which in itself is another reason to believe in it repeating Bitcoin's success.
How is FTC different enough from Litecoin to warrant interest? Also bear in mind with your answer the current cyprocurrency climate with new coins popping up daily, compared to when Litecoin was launched and slowly gained attention.