No. Don't even compare it to Pretty Cure. Pretty Cure's dub does have some minor problems, but for the most part, I thought it was a decent dub. Scripting for the most part is okay, most of the roles are decent, voice acting is okay for the most part, left all the sound effects and music (sans opening and ending) intact, and there hasn't been any cuts to the material.
As for the PowerPuff Girls Z dub... I did think it was worse than Stitch! in some ways, but I'd rather not get into that subject regarding that dub. The only thing going for the Stitch! dub is really the voice cast. The scripting, some of the direction (I thought), and the music, as well as some of the clunky cutting down the scenes to fit into the timeslot, it kind of cancels out the cast in my honest opinion. Even if it's a children's property, I still don't think it deserves the treatment it is getting. It's not something I can honestly sit down, watch, and enjoy.
Also, Soundmonkey44, we wouldn't complain unless we felt there were legit problems with it. And there are. We can't enjoy it because of these problems. We aren't blowing it out of proportion.