I voted "no" as well.

Main reason is that the EU is growing way to fast and it is not wise to add a huge country (in millions of citizens) like Turkey.

I was also against the EU membership of Bulgaria and Rumania.
Partly due to their poor economic state, and also due to the huge corruption there.

Personally I don't mind that most turks are muslim. Turkey has been a secular state since the early 20ies. They divide government and religion even more than here in Holland.