As someone who enjoys Spy thievery espionage type stuff like James bond, sly I found Carmen Sandiego quite enjoyable, I feel like it could be a big hit because it's very high quality and well produced. The music is excellent and the opening is incredible. Carmen is a really likable protagonist, Player is cool, and the action is well choreographed, and at the end of the season the mystery and cliff hangers make you want more.
however what holds the show back is i'm not quite sure what demographic it's trying to reach it constantly shifts from wanting to be some what mature to doing something more in line for a regular kids show would do. Its really weird after the becoming Carmen sandiego episodes the first 4 or so episodes are a lot more "kiddie" while the more mature story lines of the back 3 episodes of the season seem more mature. I personally think the more mature episodes fit the show better but that my opinion. I also really don't like Zack or Ivy they just don't seem to fit the tone of the show, and come across as annoying comic relief that I dont think the show really needs; however luckily there characters were reduced a lot in the back half of the season so that's was good. Which is probably why the back half of the season was better.
So my verdict is It's a really good start with glimpses of greatness and in the future I hope the show continues on the more mature route because I think that's where it shines, and either Ditch Zack and Ivy or write them to be better characters because there honestly just annoying comic relief
