I can't say that I'm already in full squee mode over this, because for that I need plot, characters and dialog, but it looks pretty promising to me. Darkish, with a bit of "La femme Nikita" and a tad "Total recall" (the Dick story rather than the movie) and Eliza Dushku is gorgeous. I imagine it must be very cool for an actor to get a role like that where your personality changes every episode, while the character develops an underlying original self.
It's to early to say, whether it's a show to fall in love with, but it's definitely going to be a bit of very very watchable television. Joss at his worst is after all still better than many others at their best.
Also while I have to admit, that from the comics I like Brian Lynch's and Michael Vaughan's writing a bit better, tv is just Joss' thing and I get the (very biased) impression that he will infuse this new project with all his creative passion, while the comics were more of a pastime and that his own squee for Buffy isn't what it was back when he did the show.
That's pretty natural for an artist, I think, to change and develop new ideas and favorites after all. So far I liked all the different things he did. Buffy, that started out as teenage horror parody fun, the film noir thing Angel had going, the space western setting on Firelfy. Generally I just love the way he combines drama with fantastic settings, his dialog and that he creates characters that get to me within a few episodes. I'm convinced he'll manage to give me just that with the new show.
He also has a pretty good eye for talented writers, so I'm sure he found some brilliant new and old brains for Dollhouse.
It's kind of amazing to be in a fandom that is just about to enter existence, when I have seen all of the other Joss shows only long after they were on air.