These are actually valid reasons for disliking Kairi. I agree about her not seeming to care about Riku and about her random keyblade, and I really do wish there'd be a KH game with her, Riku AND Sora all fighting together. I don't dislike Kairi though because I agree with streetcake. She's not a bad character but she's been involved with some pretty bad writing on the creators' part. It felt like they didn't know what to do with her and just dumped her off from time to time somewhere.
I have to disagree with you about Namine' though. Namine' I felt was used as a plot device even moreso than Kairi. What I never understood was if she can mess with memories, why didn't she just make it so the Organization forgot who she even was so she could escape? She did do a few innovative things like helping Kairi escape in KH2, but she was nauseatingly weak at times. I felt Xion was even worse, personally. But to be fair, all three characters' problems could be assumed to be a product of bad writing.
Re: continued
I have to disagree with you about Namine' though. Namine' I felt was used as a plot device even moreso than Kairi. What I never understood was if she can mess with memories, why didn't she just make it so the Organization forgot who she even was so she could escape? She did do a few innovative things like helping Kairi escape in KH2, but she was nauseatingly weak at times. I felt Xion was even worse, personally. But to be fair, all three characters' problems could be assumed to be a product of bad writing.