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That is an interesting army and could be quite fun to produce and get in character with. However, I don't think that it has much chance on the battlefield.
It is massively resilient, for a Dark Eldar army. As far as DE go, this is like our Deathwing list. However, it is slow and doesn't have much in the way of shooting. The hand to hand ability of the army is actually quite impressive, but even most assault armies could afford to sit back and shoot their way to victory.
So, I would say that it is an interesting army, but with too many limitations to win many games.
Grotesques are mediocre in hand to hand. Not terrible, but they certainly will lose horribly to any close combat oriented squad.