This book, and to a great extent for the other 2 team books, really suffered from having events intruding upon the writers' vision. From issue 7 to 12, this run has had to focus on the Apocalypse Wars, an editorially mandated event. And then it had only 4 issues (13-16) to tell the story that Lemire really wanted to tell: Magik and Sapna vs the World Eater. And the very next issue was the first of three IvX tie-in issues (17-19) and here we are, at issue 20. It just seems clear to me that 9 out of this 20-issue run were taken up by editorially-mandated content, almost half of his run. Lemire only had 11 issues to write his stories. And then there are quite a few scenes taking up space among this 11 issues to feature Weirdworld, which Marvel was trying to push at the time.
With all this interference, it's no surprise that the quality of this run has suffered.