Here's my opinion on that. I don't mind having villains who act like that or fill that roll. If they had used, let's say, Butch and Cassidy instead, I would have really enjoyed all the Team Rocket arcs. My problem was that Jessie, James, and Meowth were not only changed so drastically that they didn't even seem like the same people, but they had any shred of character they had taken away from them. They lost all of their quirks, jokes, and gimmicks that made them who they were. As pre-Unova Team Rocket were my favorite characters in the show, it was painful for me to watch these foreign characters (if you could even call them that) take their place. Even now in Kalos, they still suffer the scars of Unova. They may have returned to being pathetic, but they never got back what really made them great, their personality.