These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: The Polar Express
Accidental Aesop and Family-Unfriendly Aesop: Only if you follow orders without questions and believe unconditionally in something you have no way to prove will a jolly fat man in red who constantly talks about his servants make you a gift. This comes off as a criticism against Those Wacky Nazis, Soviets and religious fanatics. Oops.
Critical Dissonance: Despite the mixed reviews from critics, audiences absolutely loved it. In fact, The Polar Express is one of the rare movies to receive an A+ from Cinemascore.
Also even though the film got off to a slow start ($23.3 million Friday to Sunday opening, $30.6 million since Wednesday), grossing less than half as much as the second weekend of Pixar's The Incredibles, fantastic word of mouth from audiences eventually brought it to a respectable gross ($162.8 million, nearly 7 times its opening weekend).
Fridge Horror: One may wonder how Billy has failed to believe in Santa Claus all his life, not once ever received a present from him. But a child growing up and living in an abusive home is unlikely to have faith in anything.
Most Annoying Sound: "I didn't do it. I didn't do it. I didn't do it. I didn't do it. I didn't do it. I didn't do it."
And let's not forget the scene with the puppets....or that hobo ghost in general. Especially when you know his backstory - one night, he didn't make it to the hog in time, and he was trying to spare the protagonist the same fate.
Uncanny Valley: A frequent criticism of the CGI in the film. Considering how they made it, by filming the actual actors performing the whole film then overlaying it digitally, this is kind of expected.