I agree with you Zen but I also disagree to an extent. Let me explain.
I've always liked zombies, but only in the last 12/18 months has it become a new experience for me. Tranzit was a map that I enjoyed, yes it's large and cumbersome and all over the place. Yes it promised so much and failed to deliver on that promise. I still like it though, it's a good map.
Die Rise, actually to be honest, didn't really like it but having played it more recently with boom and others and beginning to like it and I think I've found my new map.
MoTD, in all honesty. Perfect, nothing wrong with the map, apart from other players who haven't got a scooby doo what to do.
Buried, I like it, it has it's own uniqueness - very easy map, still got time for it.
Origins, brilliant, map layout is superb.
BOII is what got me into zombies more than ever before. I was a multiplayer person, mainly because all the mates played multiplayer and didn't play zombies. We started to play town a lot this year and we all got a bug for zombies in a way we didn't before. Unfortunately, they felt as though origins was to tough and kind of lost interest. I however loved origins, at the beginning I thought "tough map" but in reality, it's not that tough at all.
Now, as for BO, I wish I had played that game at it's peak for zombies, I only jumped in now and again for a quick blast, never accomplished anything and actually still got a lot to do on it. However, I can see how BO is more liked than BOII.