DC *did* look rather dated when it aired on AS, which undoubtedly didn't help ratings any, but it's 10 years old for god's sake! Of course, they couldn't start from a later point without confusing the hell out of everyone...
One thing that irks me though, is that whenever Conan gets a new gadget, he's likely to never use it again (in some cases). Has he ever used that fax machine in a lunchbox? Or those suspenders that retract? It's kind of annoying... And another thing, if Conan has super-powered shoes, why doesn't he just run up and kick the criminal? Surely that's more humane that kicking a brick at them...
The bento-fax machine has never been used again, the suspenders have been used all of two times, and Conan probably prefers not to get violent unless he has to(which he rarely does, when you think about it. He'd probably only have to start attacking somehow if the criminal was threatening him or if they were running away). Also, given all those sparks that his shoes sometimes give off, it might actually be safer kicking something inanimate at people instead of kicking the person themself. On a side note, [SPOIL]Conan's earring-phone eventually vanishes into thin air, presumably because Conan winds up getting two cell phones at one point(one to use as Conan, the other to use as Shinichi), so that's ANOTHER gadget that goes poof. But in Aoyama's defense, cell phones were undoubtedly far less common when he introduced the earring-phone than they are now.[/SPOIL] On another gadget-related note...it bugs me that Conan's wristwatch only holds one needle. Is it that hard to have two? Would it mean that Kogoro/Sonoko wouldn't stay asleep long enough for Conan to make proper deductions and explainations or something? :/ I can see Conan tranquilsing most criminals more easily than him kicking stuff at them.
One thing that bugs me a little is that it's implied that time passes in the series, and it is also implied that time doesn't pass in the series(or that it passes very slowly). We occassionaly get a reference to holidays, each season has passed a few times, Conan stops wearing that suit all the time(yes, he CAN wear casual clothing!), the Shouen Tantei-dan actually becomes less annoying(Mitsuhiko in particular), and we've actually seen technology advance from the internet being something that's "Getting popular among us scientists"(to use Agasa's words) to cell phones being used even by 6-year-olds, and with all the modern add-ons to boot. But Conan's still a little kid, nobody's graduated or even been seen going on to the next grade, and Ran still acts as if Shinichi's only been gone for a few months(instead of 10 years; she'd probably have moved on to another love interest by now if the series actually did have time progress like real life). Gosho can't help having to reflect the fact that technology now isn't technology from 1996, but it's still quite odd overall.
In closing...Kaitou Kid owns your soul. Do not deny this fact. >:O (on a side note, anyone who's interested in Kid needs to read Magic Kaito. Now. Or at least find summaries of it. Or something. Kid's awesome enough in DC, but MK is where all his backstory and such is, so you actually know WHY he does the thigns he does. And...some other interesting things that I won't spoil for you. ;< Although it only seems to be in manga form, from what I've seen.)
...can you tell that I don't get to talk about this series much? D: