While I have my criticisms of "Year One" of Duggan's X-Men, I'm reticent to lob them squarely at him. After all, for most of the year, he was tiptoeing around four major events (i.e., Williams' Trial of Magento, Hickman's Inferno, Percy's X Lives/X Deaths of Wolverine, and Gillen's upcoming Judgment Day). Who's to say Duggan wasn't somewhat limited to or bound by these ongoing stories? Nevertheless, I think the character development and teamwork could have used some tightening and embellishment, if that makes sense.
Ultimately, I had fun reading Duggan's first year on X-Men. He gave each character at least one big moment to shine, if not more, clued us in to their motivations, and introduced intriguing new villains and ongoing plotlines. Moreover, he kept the overall plot moving, and no issue was ever dull or uneventful. Lastly, as a Jean fan, I am pleased with what he did with her and has alluded to doing with her in the near future. He gradually reestablished her image, identity, and power, along with her skills, generosity, and effectiveness as a formidable leader.