In Dreams... is more or less working in most realms i've been to. Its working, but not correctly
Battle of Darrowshire is eternally bugged in all the servers i've played in. However i dont think its a widely known or a popular questline. BRD Main questline, UBRS key and Ony Attu are important though.
For lower level dungeons, Archaedas, Avatar of Hakkar and ZF events do not work correctly in ED. (Rebirth had first 2 scripted tho). For 60s, scripted events like Urok, BRD Bar/Vault, Magistrate and Aurius in Strat, Dawn's Gambit and Pala/Shammy quests in Scholo dont work correctly. But the worst scripted one would be Jandice Barov by far. Never seen her working. While they do have problems, DM more or less works in most servers. Drakkisath and his adds having correct behaviour is also a good idea to include in a video.
For raiding content I have to agree Suppression Room, and possibly Chrom&Nef fights would gather the most attention if they are scripted correctly. Class calls were a joke in ED, and Chrom fight was all about abusing LoS.
Also, how does Hakkar in ZG work in Kronos? Never seen a video of that yet.
And i forgot the most important thing, the bugs/abuses/exploits in Battlegrounds and especially AV. A lot of people want AV. Multiques also.