I can't really say I'm upset about this. I'm past the point of being angry about S4. I'm apathetic, so that makes the cancellation sort of a non-event for me. I've been keeping up with Gateworld, and it seems that while the ratings were okay, there were other factors that would make the difference between renewal and cancellation. I think people can blame the success of the SG1 movies. MGM saw a way to save themselves some money.
Boy, the SGA panels are going to be hopping at D*C.