They did SO MUCH good stuff early on. Not extremely early on, but early enough in the promotion's beginning phase to where you could've honestly seen them building & expanding upon it all. The Summer of Punk, the ascension of guys like Joe and Danielson, etc.
Jamie Noble matches were all fairly epic during his short stint there. All are worth seeking out, I'd say.
I remember liking Roddy Strong A LOT more back then, too.
The Joe/Punk series is forever worth a look, for anyone who hasn't seen it.
Ditto for Nigel/Danielson, whether it be their Pure Championship encounters or their ROH World Title stuff together.
Whitmer is a guy that put out some incredible "under the radar" type work at times as well.
I always thought the Cornette/Homicide work was great. As far as sagas go, other than the Summer of Punk or Punk/Raven earlier on, I honestly think it deserves to rank right up there with the rest of the angles that helped ROH stand out as a more character-driven product than ya might otherwise have placed it within that time frame.
And, while it got a little hokey at times, the same can be said for the Jimmy Jacobs "dark side" stuff. The way it was able to tie in SO MANY diverse personalities and characters at one time was really neat. Everybody from Aries to Lacey on over to Delirious and Necro Butcher were involved in a pretty big way. Before Gabe kind of lost his balance with it, I think the tale was really enthralling & it's a testament to him that he was able to juggle so much at once with it.