Like I said, not great, but interesting, and miles above most of the other edutainment shows being shat into children's eyes at the time.
The show had some other interesting elements for a mid-90s one too, like having Ivy being the older sister and being the better fighter, while Zack was the brains. She and the kids had an endearing rivalry, which quickly turned into a level of fondness - while she was unrepentant about being a thief, she was all about the chase and would even go so far as to work with them on occasion and bail them out if they got into too much trouble. Still, for what it was, it was okay, as well as cementing the idea of Carmen as a former ACME agent herself, who was too good at her job to remain interested in it and opted to become a criminal mastermind for more of a challenge. The weird thing was that on top of that there was this layer of a player at home supposedly guiding it all, who the characters would occasionally talk to and Carmen would get in touch with by IRC to banter with, but who otherwise contributed nothing but an unnecessary nut-shot to the fourth wall. The premise was brother and sister ACME agents Zack and Ivy (Fun fact, Ivy was one of Jennifer "Commander Shepard" Hale's first roles) as they chased Carmen around the world with a magic teleportation corridor and a floating wisecracking computer head that was meant to be their Chief. Its main weirdness was doing that thing a lot of game conversions do, of bending over backwards to scream "GAME! GAME! BASED ON A GAME! THIS WAS A GAME!" In film, that inevitably means the villain declaring stuff like GAME OVER! Here, it took an odder form.
Where On Earth was a slightly shaky cartoon, but mostly a successful one.