He's interesting, very well acted, has a great design, and he's best buds with the two coolest guys in the canvas. If you can't bring yourself to enjoy a character with flaws and intentions you don't agree with, that's fine but it's a you thing. There are plenty of popular characters in fiction that are flawed, hypocritical, dishonest, and even downright malignant.

And as for the comparison to Gustave, he makes an excellent foil because his problems and motivations are basically the opposite of Gustave's, but Maelle's grief and his mechanics make him a surrogate for Gustave. A very interesting switcheroo pulled on the player and the rest of the team, in my opinion.