I still think that 多情剑客无情剑 is slightly, very slightly above 流星蝴蝶剑 but it is still very easy to read, especially compared to 山中邪神. There were so many chengyu in 山中邪神, and it’s not the case in Gu Long’s novel.
The hardest parts are introductions of weapons, persons or sect/school, etc. That’s mainly because I don’t have the basis knowledge of Wuxia lore. A lot of things are established things in wuxia world, some even have historical background like the Yuchang Jian. This means that even though I’m still a newbie in the genre, the more I read the easier it will get which feels very motivating. I feel like a lot of established concepts come from Jin Yong, but because Gu Long is so easy to read, I also think it makes sense to read him first.
Other things that can be hard sometimes are action scenes. I have to look up some words or read the passage twice, but it’s overall okay still.