Friday nights really is a terrible night for premiering new shows and it's not just Dollhouse. Dollhouse is the first show that Fox premiered on Friday nights to even get a second season in 10 years so clearly it's not just the show (
source).
It seems like what you're saying is FOX should never premiere a new show on Friday night; I don't think that's logistically possible. Especially since FOX doesn't put on anything in the 10PM hour, so they have 7 less hours of primetime to work with than the other networks.
And they have to put something on Friday nights. Are you really suggesting they should take an established show that's already doing well on Monday or Tuesday and move it into that slot, and replace it with an unproven show like Dollhouse? While stuff like that does happen occasionally, it's the exception and not the rule.
Plus, IIRC House didn't do too well originally either it was only once Fox started scheduling it after American Idol that lots of people started watching.
Do you really think Dollhouse is going to catch on with the people who watch American Idol? I watch Idol sometimes, but I don't see a lot of audience overlap there.
Oh, don't get me wrong. I can understand why a lot of people wouldn't watch Dollhouse. It's sci-fi and it's exploring a lot of uncomfortable topics like prostitution. I really doubt it ever would have been a huge mainstream success.
I don't think it being sci fi has anything to do with why it's not doing well. Other sci fi shows like FlashForward and V are doing pretty well right now. I would say the reason Dollhouse is doing poorly is because it's bleak and depressing, and the central character has her personality erased at the end of every episode. So, basically, it's a show with no lead character.
That being said the idea that every canceled show is canceled because of quality is ludicrous. Lots of shows took time to find an audience. Seinfeld and The X-Files were both really big shows that didn't do too well at first.
Shows finding an audience after a season or two are the exception, not the rule. For every Seinfeld there are a dozen Suddenly Susans that start out as crap and stay that way for several seasons.
What you seem to be arguing is that every show, no matter how poorly rated, should always get at least three seasons to find an audience. Would you have liked ABC's Cavemen to stay on the air for three seasons in the slight chance it might have turned into an Emmy winning comedy?
And your point is kind of moot, because FOX has actually given Dollhouse more time to find an audience. They should have canceled it after the first season, but by some miracle they brought it back. And people still aren't watching.
And then there are movies like The Wizard of Oz or It's A Wonderful Life that are now considered classics but they didn't do too well at the Box Office originally.
And for every Wizard of Oz that found an audience later, there are hundreds, if not thousands of movies that you haven't even heard of because they've been completely forgotten. And a lot of those movies are probably way better than Wizard of Oz or It's a Wonderful Life, too.