I think I speak for a lot of people when I say, "Bummer."
It wasn't a great show. But it was starting to be really consistently good, with occasional bursts of excellence. That's the shame of it; if SCC had been deep-sixed after first season -- hell, after the pilot -- I wouldn't have minded. But it started to get better; more than that, it started to get *different.* Not only did the show start frequently firing on all cylinders, but even its failures were interesting, and it began to get to the point where I really wanted to see what the show would do next. Alas, I won't get to find out. Nor will I get the spin-off about Weaver, Savannah, Ellison, and John Henry.
Some more thoughts in my piece at Strange Horizons, written before the news came down. I will say that it's a shame that the show goes off the air just as the fandom is coalescing. Maybe we ought to have a valedictory fic-off, or something.
Meanwhile, FOX brought back the execrable DOLLHOUSE, which has thus far been largely a spectacular failure by Whedon et al. We'll see if it gets better season two. I'm doubtful, but then I'd written off SCC at this point last year.