The #1 reason why you should like this book is because it's hilarious. It's difficult to resist Ethelbert, the petty six-year-old dictator who thinks that comics, dinosaurs, and meeting Santa Claus should be at the top of his country's priority list.
(And really, who disagrees with that? Clearly the world would be a whole lot better if we all took some time out to worry about getting to meet Santa Claus instead of negative amortization and whatnot.)
The #2 reason why you should like this book is this: when Ethelbert rudely interrupts his scientists to ask them to drop everything and make him a dinosaur, do you know what happens? They actually manage to make him a dinosaur! Tiny Tyrant: a believer in the awesomeness of science.
#3 reason? There are giant ice cream sundaes.