The key improvement over Carcassonne IMHO is that a game finishes in 20-30 minutes, with each player placing about 16 tiles. (In Carcassonne the game ends when all ~100 tiles have been placed). You can also put a minute bit of strategy into your Māori game as only you are placing tiles on your board. On the other hand this means there's less interaction between players, and the potential for a lot more analysis paralysis as a player may pause to examine every other players' boards before deciding what move to make.
Overall the game feels a bit flat -- not much complexity, need for deep thinking, or interesting interactions with players or the game. Worth a try for someone who loves Carcasssonne and wants to try something different but I expect you would stick with Carcassonne.