I recently listened to a great podcast episode all about looking at everything in the Drukhari codex in terms of competitive play. This is just part 1, and I've already learned a lot.
http://thebattlehosts.com/be-better-gamer/episode-90-drukhari-part-1/
[The Battlehosts - A Warhammer 40k Podcast] Episode 90: Drukhari Part 1
http://podplayer.net/?id=72389266