I think it was a good thing that Satoshi left.

Satoshi was simply a single point of failure, some obvious element of the system that could be attacked, especially knowing how many Bitcoin this person amassed.

When Satoshi left, Bitcoin became that little bit more decentralised, as others had to take on the lead development role and the community had to allow others to take the lead.

All the decisions about Bitcoin's future with regard to technical issues is now heavily debated, if Satoshi were still here there might not be a debate, just a decision.

Most of us in the community agree that Satoshi's departure was for the good of Bitcoin.