Bitcoin is in many main languages but not Japanese. Why would the guy who created it not make it in his own language? Don't you find it suspicious MtGox is in Japan?
Also the project really isn't a success. A lot of progress still has to be made. Security is still an issue along with sites still growing. Anyone ever even talk to him? I'm not saying he isn't real I'm just putting this out there.
Well you cannot say (s)he or them is or are not real cause the name satoshi couldn't have magically printed itself everywhere from the beginning and Bitcoin couldn't have done the same either, so someone or some group put this together. Regardless of whichever flaws you believe there are to the network, this does not discredit Satoshi and Bitcoin.
Regardless of whether it's a person or a group, they still exist whether it was created or created by themselves, they are still anonymous, who is the mastermind behind the creation of bitcoin.
It doesn't matter about that satoshi will still be a satoshi with the anonymity he currently has and bitcoin in his control if he wants to because of course the full power of satoshi will definitely be hard to match over bitcoin