Read most of them in french, Tintin is just a mentally challenged doo-gooder that is super lucky anytime he gets into trouble. Also he lives in an incredibly manichean, racist and sexist world for our modern standards. The whole thing is devoid of actual humor, replacing it with a few pathetic characters you can laugh at. But all of this was a constant in the first half of the 20th century, I can't really blame Hergé.
I obviously was too old and knew too much when I read them.