Matt Hurt’s review published on Letterboxd:
So that's how it all started!
Klaus is a very charming take on the mythology of Santa Claus and Christmas. The trademarks of the Santa story (coming down chimneys, flying sleigh, ho ho ho, etc) are given fun origins that are surprisingly clever at times.
The main character has a pretty straightforward redemption arc that I feel wasn't explored deeply enough. Same goes for the two warring factions in the town. But Klaus (voiced by JK Simmons) is a particularly good, gruff Santa.
Pretty charming movie. Also, the animation is stunning.