I'm thinking it's because Mighty No. 9 had to live up to alot of expectations in the wake of Mega Man fans wanting a new game for so long that it's initial big hype and optimistic outlook just plunged into more cynicism with delay after delay for unclear reasons and a result of bad communication being to blame from the dev team's own words.
That's what I'm getting from the Mighty No. 9 matter in a nutshell. I didn't follow the game's developmental progress and updates at all but I heard that when the game was close to being released, the general reaction was incredibly mixed and after the release it just exploded, and from the footage I saw on YouTube from game reviewers and actual gameplay video's it looked rather bland for a 4-million budget title and that the online co-op seems to be a mess.
I do feel bad for the people who really wanted their money's worth from the kickstarter on that game, but I guess the reason why Yooka Laylee isn't as heavily debated then is because from what I see on the main project page, the dev team shows how the game's coming along, and to me, they deliver. I might have missed the opportunity to donate, but I sure have optimistic faith in the game and will buy it when it comes out. I just take the lack of heavy debate regarding Yooka Laylee's quality after how MN9 turned out as it being in the non-controversial camp like Meinhard1 says.
( Also slightly off-topic, a pleasure to meet you guys.