My third game (and a second 3-player as such), and now we had Slaanesh fixed. I was very unlucky with World Events as they topped both nobles and I was left behind in the threat meter. I felt that I used "move N-, H-, P-token"-card too early and should have held on to it for emergency use only. I had hard time coming back from this but in the end the victory was still tight between all three of us (although my chances were very, very slim).
I think Slaanesh is bordering vulnerable with the noble tokens, if the event cards wont give you any hero or noble tokens like in our game. The next noble tokens come quite late in the threat dial and weren't that useful anymore (in this game at least). I was already seriously handicapped.
Of course next time I know to hold on to that card... although the luck might have you even more seriously screwed, if those cards are at the bottom of the deck. Even more so, considering that Slaanesh wont churn through the deck like for example Khorne and Tzeentch..
So my feelings with Slaanesh now is that it's more dependent on luck on the start than the other three.
Of course Khorne is luck based basicly every battle, yet he throws so many dices that I think it evens out a bit better.
Tzeentch has 3 warpstones at start and it can make more available advance threat places with his magic Chaos cards.
Nurgle has always 4 places. Although as they are not random this can be used as weakness, because you know where he wants to concentrate and he cant move them.
Of course in a Slaanesh-Khorne-Tzeentch 3-game Slaanesh is obvious first target for Khorne as he can easily narrow his targets, while Tzeentch can fiddle around more easily. Although I'd imagine that to be in 4-player game also as Nurgle still has 4 good places to start.