I love this show. It has great characters, cool villians, intense action, and hillarious humor. You can't help but fall in love with these characters. I really love the relationship that developes between Ron & Kim.
My favorite characters though, were always Ron & Shego, but for some reason I never really cared for Dr. Drakken. I also must admit that the 4th season was my least favorite, and it felt rushed. I still get sick at even thinking Drakken & Shego could be a couple... ewww! I mean it doesn't make any sense, and it was a stupid decision by the writers period. Shego should remain single. I won't ran any more than that.
Despite a less entertaining 4th season, seasons 1-3 were very well done and contained a lot of appeal for both kids & adults. It's a great show, and I'm glad to say I enjoyed watching it.