Blanket statement that you shouldn't take any 2-3 year olds to a movie is dumb. My 2 year old sat through 2 movies this week without a problem. My son was 3 years and 4 months when we took him to Coco. He sat fine for about 2 hours, but started getting restless toward the end.
2 1/2 hours is a long time for an adult to sit in a movie. Kids movies shouldn't be that long.