I thought MN9 was "fine". It wasn't great, but it got some hate it didn't deserve and a lot of the issues are absolutely issues in the lower quality MM games as well. The dashing mechanic was fun and I actually enjoyed the speed run/single continue challenge modes. Once you got a hang of the mechanics, it wasn't any more difficult than a standard MM title.
There is one level that is absolute trash though, and far and away my least favorite level in any of the MM games. The art style is also hideously ugly and the voice acting is embarrassing. Overall though, if you like MM games this one is disappointing but certainly playable imo.
Moops?
"I thought you were making up diseases? That's spontaneous dental hydroplosion."