Countdown to adventure was part of countdown to final crisis. And it was the only series he wrote by himself. Thus the reason I thought you where referring to that series in particular. As far as countdown goes, it made perfect sense in the context that it wasn't supposed to make sense because of it taking place on an alternate earth/earths. I thought it lead up to final crisis quite well. Then again ignore me, i'm a DC whore.
I'm a gigantic DC whore, and Countdown to Final Crisis made no sense. Officially, this is what happened:
Grant Morrison thinks up Final Crisis, Didio accepts it. Morrison asks people not to use the New Gods in the next few years so he can make a real blast with his storyline.
...Didio, still mad that 52 didn't end up the way he wanted it to be (and was incredibly good), deems Countdown "52 done right", and makes it so it has a Death of the New Gods plot, along with tons of clusterfucks, and little to none Morrison involvement.
...it ends up in absolute [parasitic bomb], and most has to be retconned. Final Crisis is still ONE HELL OF A BOOK. One of the best comics I've ever read, and still the one comic I own which has post-it notes on every single page explaining interpretations of every single sign and event.