Agreed he reads better in chunks. I ultimately ended up loving his X-men run, and his GoTG run reads better once you realize it's a giant tribute to Bwahaha-era Justice League. (Also Daredevil, Alias and USM are probably his best Marvel work). His Avengers run should have been shorter tho IMO.
I don't think it's bad. Pax Americana and that SHAZAM! story own. I just think the whole meta narrative fell apart towards the end, and it was a bit uneven. That being said, a Morrison "failure" is more entertaining than some writer's successes.
Read it and have my copy signed by Morrison. It's a neat read, but I remember David Brothers taking Morrison to task about some comments about race.
Re: Final Crisis.
Finished my re-read last night. Missing my copies of Superman Beyond and the Batman tie-ins really does fuck with the story in the middle, Green Lantern stuff aside. And the art kinda suffers as JG Jones misses various deadlines, and more and more fill in artists are brought in. But holy hell when this story works, it works, especially when it comes to the characters Morrison likes (Tawny, Kyle & Guy, Superman and Mister Miracle II).