@Lain @Shadow
Has there ever been a sherlock holmes story where Moriarity's organization is well-developed than him, moran and a bunch of faceless goons?
Oooh, this is hard. Like
@Lain said, canon's really spotty on this? (I assume ACD was just like "no need to go into depth if I'm killing them both off!") And anything outside of canon that goes into depth about Moriarty is usually entirely focused on him. But most of the Moriarty-centric pastiches I've read are exactly what you've described. :/ If you'd like, I can try asking a couple friends of mine if they have any recommendations--one reviews pastiches and the other is kinda an expert in Moriarty-centric stuff (if a hobbyist can be an expert, I guess? anyway, she's read all the things) so they might have ideas. Off the top of my head, though...
Elementary kinda did this? All the aspects of Moriarty's web are brief, but decently well defined.
If you only watch those episodes. The only problem is that...it kinda has a similar but opposite problem to BBC's Sherlock? Lots of teasing, but instead of BBC's "we're going to tease at him but all you get is us dangling his corpse in front of you and no new info" angle, Elementary basically goes "we're going to tease at them and then 90% of the time you get nothing at all". So...if that's the entire reason you're watching the series, for info on Moriarty and their empire, you'll probably be very disappointed. (They still did better with adding detail to the empire than all the other film/tv versions I've seen though, which is kinda sad.)
Pastiche-wise...the only ones I can really think of is Michael Kurland's Professor Moriarty series. It's mostly told from the pov of a journalist who, after being arrested for a crime he didn't commit, essentially sells himself into Moriarty's employ for two years to save himself from being executed. (The series actually spans 1885 - 1891 so far so LOL "two years".) Kurland
really doesn't go the usual route with Moriarty's network--it's not a massive, sprawling one like most versions show, it doesn't go the supervillain mastermind-with-an-army-of-nameless-goons route either; it basically establishes it like he's a specialist with a small group of regulars he relies on and occasionally involves other people for more specialised bits. And it's very character-driven, so the network members are nicely developed. The only thing I can really think of that might be a downside is that the later books have more of Holmes and his and Moriarty's frenemy, bromance obsession thing and them working cases together than stuff with the network...which is in no way a problem to me, but if you're only reading for organisation stuff, might be not what you're hoping for. (If you want, I can send you copies of the ebooks, at the very least for peeking at.)
Sadly, though, it seems like people are hesitant to just focus on the organisation? I, personally, am not a big fan of most versions of Moran, so seeing someone go into it with a totally new character and exploring the organisation that way would be a really cool idea for a pastiche. But I'm guessing, considering that ACD's estate was bullying pastiche writers for ages, writers just didn't want to bother wasting money and energy on working on that when they had to deal with the estate and the possibility of people not reading it if it didn't deal mostly with recognisable characters. (Which makes me sad cuz I'd read the hell out of that.) But, again, if you'd like I can ask around?
Sorry for rambling.