Sci-fi in the US as a network was essentially built on this show after it aquired it from showtime, it pretty much single handedly put the network up there with the big hitters, if you dont beleive it look at sci fi from other nations, almost none have SG or BSG(what looks to be the succesor show for sci-fi US) and they dont do half as well and are very much fringe channels all sci-fi stuff of merit goes to other channels(like sky one in UK and Europe).
Interestingly that havent cancelled the spin off that airs right after sg1 atlantis which is usually considered not quite as good, its basically a copy of the original in a different galaxy.
This really annoys me, if ever i might any of the network execs responsible for cancelling this and firefly they are getting a slap.