I liked Dollhouse, it was brave in its subject content (probably put a lot of people off.)
But I wouldn't have said it was better than Firefly. Firefly was elaborate in its storytelling and effective, with only one season it delivered one hell of a punch.
Dollhouse was dealing with big issues and had two season to move somewhere, but it didn't feel like that happened. It was a series of wake up, dress slutty, fall asleep, with bits of great plot intermittently. Surprising ending to be sure, cut off before it reached its prime? Definitely. It had some loveable characters.