Just take The Legend for example, it has quite a large following around here and soompi because at a bite-sized 24 episodes it's easily digested.
Legend is kind of a unique situation because there was a mountain of hype for the show going on well over a year. In fact, a lot of people were waiting to see whether The Legend would be "The Ishtar" of K-drama, due to the negative press surrounding it. I always saw The Legend as a Hallyu show, rather than merely a Korean sageuk. To a degree, the same applied for Jumong. MBC actually ran "behind the scene" shows for both Jumong and the Four Gods before they really started airing. Both shows cost way, way too much to be merely successful among the traditional sageuk demographic (men over 40? women over 25.)
To me, what Dramabeans says about her attitudes toward sageuks really speaks to the normal D-addicts and much of Soompi feel about it. The other thing is, the Soompi/D-addicts community watch a lot of the teen-oriented shows that are not popular at all in Korea, but for the Netizen community. New Heart generated higher ratings than Coffee Prince; Happiness has been a solid hit for SBS. Likable or Not has achieved national drama status in Korea. But there's relatively mediocre buzz on these shows.
Another thing is perception of actors and actresses. Han Ji Min is very, very popular, maybe only one level lower than YEH in Korea. It's because she also does Entertainment Relay for KBS (that's KBS's "Entertainment Weekly" program), so people watch her every week whether her show is on any other channel. She's one of the very, very few actors under 25 who appeals to all age groups.