He still shines the most in Ice Golem/Dragon, and is still quite a strong solo farming option in Dragon. 

Could certainly do work in Faction Wars and has his place in certain Clan Boss teams, too. 

Personally I use him for solo farming Dragon. Solo farm IG requires quite a lot better gear, to deal with the nuke from the boss.

I'm working on Demytha-Heiress-Doomscreech-Seeker unkillable and Demytha-Seeker-High Khatun(trying to replace HK with Lyssandra as I used HK as food before I really understood the game).  I have to test the Myth Seeker speeds since Lyssandra, while similar, is not the same.  So I turned my focus to Myth-Hier alternate.  Easier to acheive but only one DPS vice the two for Myth Seeker.  So, based on that, I have two questions

1) Would either BEK or Fu Shan (pulled during CVC) have a place in either?

2) Should I replace my Fully booked Fayne with unbooked BEK or unbooked Fu Shan?  My current team is Vogoth, Giscard, Fayne, Ninja, Vizier Ovelis.

All things equal, I think I'd like both BEK and FS in my Myth Seeker once I figure out the speeds.