Yeah, I think the common perception that "Syfy cancels everything too soon!" stems from a few high-profile fan favorites (Farscape, SGU,
whatever) that were perhaps cancelled before their time, despite the fact that even Farscape
ran three or four seasons--which is longer than the original Star Trek
There's no rule that says every genre show is guaranteed a seven-year run!
(The EUREKA thing is particularly puzzling. I mean, it's not as though the show was murdered in its cradle. Most shows would be delighted to run five full seasons!)