It feels like the developers tried to do a lot of different things with this game and you can notice it by playing and if you turn on the comments from the developers.
What I like about the series is how lighthearted Guybrush is and how no one believes he was the one responsible for taking down the ghost pirate LeChuck. However in this game, Guybrush has this cockiness in him, understandable, but still feels out of character. The story was also poorly written, it keeps on promising this huge reward that keeps on building, but it doesn't deliver.
There is something that even the devs mention several times in the comments: "why is the game so long?", that might be a weird thing to say, how can a long be bad? There are 3 major islands you visit, the game is long in the following matter: Puzzle in island A, visit island B to that has an item for island A, but you have to visit island C to get the another item to unlock island B's item, and that happens several times and it takes times, specially if you don't know what you are doing. That's how "long" the game is.
It still has some of the characteristic humour of the franchise, but it feels like a weird game, I wouldn't play it again. Secret and Curse are better games.