Yeah but FOX will do that sometimes, they'll take a chance on a show, but then either rape its concept OR when they see the slightest dip in ratings or whatever they can it outright or just fuck up the scheduling to the point that its hard for it to gain legs. ABC does the same thing too. Look at stuff like Lois and Clark or Pushing Daisies, they started out really good, but then they kinda lost it when the network (although in P.D's case it was the stupid writer's strike that hurt it) but ABC sort of didn't give it the attention OR the timeslots it really deserved. Look at how they uberhyped Desperate Housewives and Brothers and Sisters (the latter of which I still don't understand how its lasted as long as it has - its 'ok' but not 'great' either)
So for V I dunno how it'll do in the long run, my guess is, it won't last. They'll barely get through their initial order OR they'll end it on a random episode and then burn off the remaining episodes on a Saturday or something