I like that this has Vlad actually coming back and being good enough to hang out with them all and Jack and him are friends again like some of the old college pictures showed. (Though why Vlad's fist the air while the packers hadn't even moved... that's beyond me) Don't get me wrong, I love him as the villain, but ten years after the Disasteroid maybe he's mellowed out in his old age. He'd be about fifty now.
Ghosts. Valerie. Vlad Masters. Danny's parents. Tucker in the episode where he becomes a ghost. Jazz in the episode where she goes after Vlad Masters.
So by your logic you hate all of those characters as well? Lmao people make mistakes, it makes good conflict. It'd be a boring show if only Danny's parents caused him problems. Too black and white, ya know?