I genuinely loved every second of GoW3's campaign, and I really felt sad when Dom sacrificed himself for the team! I sometimes thought when I was going through the previous campaigns that there would be sections I knew I'd seldom be revisiting, but apart from the underwater section in 3, I found all of it to be unrelenting, and absolutely amazing!!
I think its the increased level of humanity from the characters, you really felt like you were fighting for something, and that it could all go wrong.
Did you guys like it as much as me? Any sections you could have done without, or story sections/characters you werent keen on?