Are Grey Knights really changing the entire game of 40k, folks? I mean seriously, they aren't that bad. There are a few armies who seriously will just struggle (sorry Nids), but let's face it. GW has done a fairly good job of keeping the game balanced. If you don't believe me, take a look at 7th edition WFB for a look at unbalanced. We have it made folks. Now take a minute to stop crying, change your underpants, and relax.