i feel like this is just unwarranted anger. "he use to be a sweet boy, but the money and power changed him" is enough to put his character into context. he use to be the way he was in the original series but then he turned greedy, and im sure there will be an arc surrounding that. who knows, he may return to his selfless nature later in the series.
but as whole, they needed to take a lot of creative liberties with the show if they wanted it to suit a modern audience. it seems like in the original series, characters were either incredibly well-meaning, or villains. but now pretty much all characters, even the triplets, have their own distinct personalities.