http://www.dakkadakka.com/dakkaforum/posts/list/460371.page
That's pretty much my thoughts on everything
GK.
The short version, psycannon spam is effective but I fear it is not the only way as it is actually rather insufficient vs the newest codexes like Tau and Eldar who both horribly out range and out AP1-2/instant death us while being more maneuverable so we really don't get to pick our encounters as much and usually are on the trailing end of the firepower curve. Also they are fast enough to be fairly hard to assault.
With the current meta, look to allies.
GK's power curve is quite on the mid tier now. We're still good vs lots of things and can hold our own vs most builds but the most cutting edge builds from the newest dexes really are focused at taking out
MEQ which no matter how you look at it, we're no more survivable than regular
SM while costing more.
GK can be still good at offering a mix of shooting and elite assault units but really does better in a support role while main guns from other codexes (including now both Eldar and Tau) does the grunt work and provide cheap scoring troops in bulk. Henchmen builds are still somewhat effective though we really lack good leadership in many cases and razorbacks are a bit too fragile now a days to make a list by themselves very effective. AV11, meet
str 6/7 spam at high volume...