So, finally got around to watching it. Gonna go ahead and do this, because I know plenty of people will get their panties in a bunch if I don't:
Regarding the instantly-infamous Red Wedding, I didn't see that event in particular coming. However, I had a sneaking suspicion that Walter Frey had some evil in mind- major kudos to his actor! Excellent twist, and a kick in the balls to be sure, but I think people forgot just how harsh the series had been up to this point. Grimdarkness in of itself a compelling narrative does not make, but I'd say it's being used quite well as a narrative tool.
Obviously I haven't read the books. Bite me, yadda yadda. I never liked Rob that much as a character (I thought him and his portrayal were rather blandly "heroic"), but currently I'm way more concerned about the war effort. The Northerners are probably screwed, and I don't even need my Dwarf Fortress-honed "screwed sense" to make that conclusion.