I think it is quite fair.
The Blood Angels Codex is a brilliant piece of work with excellent balance between the different options and play-styles.. Jumpers, Mech, Dread-wall, DC, etc.. all army variants work wonderfully in singularity or combination. All are viable. None of them dominate the game to anywhere near as much as Melta-Vets or Long Fang/JoTWW-spam.
Dark Eldar are quite on the weak side with Raider/Venom-spam being the thing that keeps the thing afloat. I haven't seen anyone play a viable foot-list, Hellion-list or any other theoretical option. They all fall under the powercurve resulting .. like Space Wolves, in a sub-par spam-codex (if, unlike Wolves, at the lower end of the field).
The Blood Angel Codex is a brilliant contribution to the game. The Dark Eldar Codex a huge missed opportunity (especially given the brilliant new models).