All of Dollhouse.
Started out kind of slow - the first half of season 1 is pretty much standalone "client-of-the-week" stories. But once it gets into the serialized story, holy shit does it get awesome.
I wish it hadn't been cancelled, just because the second season is so obviously 4 seasons crammed into one. Hell, Whiskey's whole second-season arc is crammed into the first episode of the season! It just feels very rushed in season 2. I mean, the season 2 stuff is very good ... I just wish we'd gotten to spend some more time with most of it, since it kinds just jumps from BIG EVENT 1 to BIG EVENT 2 without getting time to explore the ramifications of BIG EVENT 1 very much.
Thankfully, because of the cramming, it did get wrapped up pretty nicely. I still want MORE, but it was nice that season 2 gave us legitimate closure on the story.
Amy Acker needs to be in more things, though. So does Fran Kranz. His manic, slightly-mad-scientist vibe throughout the series is good and all, but he really shines in Epitaph One and Two as a broken shell of his former self - heartbreaking, really.
The best thing about the series for me was how much it really made me think about the implications of such a technology - about our identities, and about how much our bodies and our minds are one ... or not.
I mean, I love most of Joss Whedon's stuff, but Dollhouse is the only one of them that I've constantly thought about ever since I finished watching it - which was, at this point, about a week ago. And I'm still thinking about it.
The post-series comic miniseries (Epitaphs) is pretty good, too - it does a decent job of filling in the gaps between The Hollow Men and Epitaph One/Epitaph Two. It's much more successful than Buffy Season 8 was, anyway (not up-to-date on Season 9 at all).
Anyway, Dollhouse = 4 artificially-created personalities out of 5. Would have been 5/5 if it had been given at least another season - some room to breathe instead of cramming 4 seasons into one.