Agreed. The first one was obviously aimed toward the younger crowd. Once they realized older people we're into it and that the cast was maturing as well the movies got better imo.
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Harry Potter is actually written for the same group of people throughout the entire series and ages as they age, so it doesn't get darker to be re-aimed at an older demographic but rather its audience who were 10 when the first book was released grew older and the book grew with them.
So when "The Philosophers Stone" was released in '97 its readers were aged 10 and as they get older it gets darker until they are aged 20 which is 10 years down the track in '07 when "The Deathly Hallows" is released. Instead of remaining childish the entire time and having to get picked up by new people every 2-3 years it follows that one group as they age. Its a brilliant way to write a series and allows its readers to continue to enjoy the series even as they age.