I have to agree with the two above posts. It's not so much that they're more evil but they've been given minimal appearances in the current series and when they do appear, they're actually working on actual missions besides chasing after Pikachu. They've also taken away alot of the humour that came with them with I'm mixed about but I do enjoy that they've learnt from their mistakes. If that's a true test of time, I don't know what is, haha.
I do think that they have become a little less engaging with the main group and they have their own side plot which is cool. I kind of enjoy it but miss the humour they added to the series.