Advise: just rewatch the show. I loved Hannigan in Buffy, since then I can't stand her ;-)

So this wasn't half bad. The story was very Kim Possible with a good amount of attention paid to the finer details. Athena's (an OC for the movie) motivation was kinda weird especially that scene with her and Kim towards the end. Kim was okay, a bit too preperation-obsessed and melodramatic than the original, but not enough that it felt like it was too OOC (not enough to get annoying). Ron was great. Drakken was great. Shego was spectacular, easily the best in terms of staying true to the source. Wade felt weird to me. I remember the show portraying him to be more mature and seeing a 10-yr old genius felt off. Overall I think the movie did a decent job of capturing the essence of the show and even got most things right. I think Ron, Drakken and Kim's dad were trying to imitate the original voices in some scenes. And, of course, Rufus was the best thing ever! Something I didn't like was that they replaced the kimmunicator with holograms.

Of course cheesey but it’s also cute, charming and harmless. The casting of Kim and Ron is perfect.
Even if Kim is too much of a cry baby in the second half.