I don't see that as being any kind of problem because in the first couple of episodes the dolls are essentially props with modular identities. The actual characters
are the people who work for the Dollhouse and also Agent Ballard.
I saw this on Netflix a couple of months back because honestly their sci-fi library is pretty small. It was surprisingly solid, if there's a couple of weak episodes (the one about the pop singer), it mostly works because it's willing to let you hate most of its cast, although it sort of wants you to come around to them at the end.