Well, for now, there are no Daemon Packs... only lesser daemons...
Lesser Daemons have their roles...but they are such utter crap compared to the previous daemons that no one uses them...because you'd be nerfing yourself.
DH, IMO, are the most underpowered Codex, for that thank GW.
DH, are not bad versus Chaos, they are bad versus everything.
Really, DH actually has things that are specifically good versus chaos, rather than other things, example:
Grimore of True names: only affects daemons ( Greater Daemon and Daemon Prince come into mind)
Sacred Incense: only affects all Chaos units (it can be pretty devestating)
Psycannon/Incinerator: good at killing the 3rd edition daemons, and these new daemons... but they are rarely used these days, and the weapon themselves are not great versus the marine portion of the army.
So... DH inherently suck, but they do have stuff made specifically versus Chaos...so they get a leg up in that area.
NOW, we'll just have to wait til the new Daemon Codex come out... then re-evaluate this situation... IMO, nothing is prob. going to change...
My 7 Cents.
