Ok... here are my thoughts on this whole thing...
*sets up barricades for angry fangirls/boys*
Both Kaitou Kid and Kudo Shinichi are overrated. (they are practically the same character only opposite sides of the law)
There is a reason for this... THEY ARE BOTH PERFECT. They are both the main protagonists of Gosho Aoyama's works. Gosho made very few faults for each character (less so for Kudo... I mean... does he really have a debilitating flaw like Kaitou does?). They are both geniuses, can think much further ahead than their adversaries, can predict outcomes and trick their foes.
Allow me to run through this real quick for both, and then I'll explain why they are both overrated when compared to literature... (by quick I mean as quick as I can)
Lets start on topic with Kaitou Kid... He was the main protagonist of MK turned antagonist for DC. He was perfect in MK, so Gosho couldn't very well add in flaws, because he can't flesh them out (though he never did give the explanation for the fear of fish... perhaps one day). He is arrogant, a master of disguise, EXTREMELY intelligent (possibly more so than Kudo, and I'll explain why) and is a master of Magic. These things combine make him a very effective (and slightly boring thief after a while). He can memorize a lot of information very easily in a short period of time, including numbers, personal information, mannerisms, voice and building layouts. Basically he has an eidetic memory, something Kudo does not have. He can plan and even deduce slightly (though not as good as Kudo). He is shown to be extremely good at school without even thinking about it (aoko too for that matter).
When it comes to adversaries (and this is where it gets boring) Gosho does NOT want one of his original characters to lose. This includes against Kudo. He has a tragic back story, and though he is a criminal you are meant to empathize with him. He isn't out for monetary gain, he has his father's estate. That is why he returns all jewels he steals if it isn't the Pandora jewel. However Kudo can't lose either, so Kid gets away and Kudo ends up getting the jewel. (Again boring)(Also I think Gosho doesn't want either of his creations to lose)
Aside from fish (which no one seems to know about) he has no discernible flaws. This makes for very boring characters. His arrogance is his biggest flaw and that usually works out. Jii is a professional so he isn't much of a liability aside from age. And he doesn't have any other partners. The character he is based on is much more interesting in this respect, which is Arsene Lupin. Lupin has no experienced colleagues, and has to woo girls into helping. They are inexperienced and his care for them are usually his downfall. Women are his weakness. Since they are also an integral part to his thievery, it is BIG (so not like Aoko or fish, because those don't impact him as much as slightly inconvenience him). Kid also has no worth adversary other than Hakuba (who is never around) and Kudo who is now always around because they are melded together. Nakamori, the main force is not up to snuff. Even Lupin III has a better constant antagonist in the form of Zenigata. He is not incapable, and he often is able to corner Lupin III if not for the last minute intervention of Jigen, Fujiko or Goemon. Arsene Lupin has Ganimard who CONSTANTLY corners or captures Lupin only for him to trick his way out or escape by slipping cuffs or other method.
He is an uninteresting mary sue-esque character... Too perfect, not enough flaws and not interesting enough.
Now on to Kudo... HE IS THE EXACT SAME! Except swap out magic and eidetic memory for deductive ability and overall strange compilation of academic and scientific knowledge (oh yeah, and thanks to Agasa and his Mother that INCLUDES disguising, with the exception of mimicking dialect). He has no flaws except his arrogance (which should have killed him at least 3 times to my memory). Granted his arrogance is EXTREME, but still he has no worthy adversary other than the BO. They barely show up, so he basically has no one. And the BO he has the FBI backing him. They are a big adversary who can provide a challenge, but THEY ARE BARELY AROUND! Kudo has no other weakness other than his stature which isn't a weakness anymore thanks to Agasa's inventions. He can kick objects stronger than he probably was able to before, has tracking glasses, a skateboard that goes as fast as a car (he isn't yet old enough to get a license in Japan). Hell he seems to have overall less flaws than he did before. He only has three liabilities... And honestly if they follow him to the BO he should let them die... They'd deserve it, and so would he for getting them involved with such a dangerous case (and not being able to trick them into going elsewhere).
Again overall boring. Every single detective had flaws in the past. Sherlock had the same set-up, but the difference was that the mysteries often actually was able to test him (though Sherlock was an addict and slightly crazy). He was also limited because he often didn't have free reign from the police as they were always getting involved, often resenting him, where as Kudo is LOVED by the MPD (even as conan to a degree).
Now I know this is a family comic/show, but Gosho should have put more effort into making complex and believable characters. He has developed the cast around the main characters except for Kudo and Ran (of those who appear enough to develop). IT IS INFURIATING.
They are both overrated and have better counterparts in literature or other shows. They are not dynamic, interesting or even evolving. And unlike Holmes he does not have fantastic writing to back him (and some interesting peculiarities that Kudo does not). Gosho is good, but not SACD good.
Honestly what keeps me coming back to DC is the side characters, not the main (well that and the mysteries, which have their ups and downs. Some are fantastic other are dismal but you can't win them all). Usually its the characters that keeps me interested in a story for the most part (well it has to be a balance between good characters and good story). DC is the ONLY one where it is the side characters and mystery.
Thank you for reading this overly long post And I really hope I don't get flamed or attacked for it....
*reinforces barricades*
@Waka: They explained that Sharon Vineyard was better at mimicking voices than Yukiko was. Yukiko could adeptly change her voice, and make it sound different for characters, but not mimic another person entirely. Basically... Sharon can completely take on the identity of someone else, where as Yukiko can only create a new persona (which for the purposes of acting is all you need).