the best one i ever played on was the sadly shortlived CAP by 9fires,fully realised monster races,orcs were bloody scary!,random by area loot,even the dm couldnt spawn loot!,differant spawns/effects depending on the time of day,[dont go THERE at night!],random things happening,eg: those goblins would spawn and raid the town!..or someone would hire assasins too kill you!.say a certain gods name in vain and bad guys would show up...and chase you ,even if you teleported out of there,from over 6 screens away!,into and out of buildings![hide under the bed time!]they would track you down!
other things i would like too see.
Reputation by race and your actions,if you are a half orc,no that human village will not let you in!,the npcs wont talk too you except too say go away and guards will run you off!
Undead...all those villagers will produce torches and the priest will come out too help!
Kill a npc?...ok see the barons castle,those guys will send out patrols looking for you ,your wanted poster will appear in towns with a bounty!
Subraces that actually mean something on the server,rather than being a new shiny skin with a few stat boosts,so if you do actually meet a lich,vampire,ye rusty old saw...its unusual and scary...and if you are playing one...its difficult!...with the relevant drawbacks in that setting.
Getting back too the CAP server,9fires had the best ever quests I have seen.
low lvl,go find chalice stolen by goblins...ho hum you think,nope, theres 3 or more ways too get it,then when you return 3 choices when handing in the quest[hand it over=xp and gp/say you couldnt find it and keep it for the once per day=xp/say you killed them but its lost ,destroyed-gp],but each of those choice led too 3 differant new quests with the same divurgance of paths with a subsaquent effect on your standing with the church,village etc...amazing stuff!
Weapons that are integral too you,not throw away my family heirloom as soon as a new shiny appears,one that grows with you and your char choices influence that.
good monster AI!, and random spawns having a chnce too surprise you.
traps and locks for rogues,stuff that you need differant chars too access,like doors that need too be sung open and stuff.So that one guy cant grind too 40 and solo it once per day!
Bosses with the chance of random reinforcements...eg:ohoh,looks like the giant king was having a feast today!
Id say from looking at it,have a look at ffbj,s stuff too,and amethyst dragons and have good look at the custom forum for ideas.
Well its late here,so thats my 2gp for the moment!...others feel free too chip in!