The Grey Knights are, apparently, not a top rated army. I’ve seen it said that they’re the worst in 8th Edition 40k. However, I find them a bit of a handful. The mini smite that they can all do causes an automatic 3 Mortal Wounds to Daemons and with their Gates of Infinity psychic power you can’t pin down a big unit in melee combat, it’ll just be gated away to shoot you again.
So I enjoy playing them, I find them a challenge, an army that’s armed at taking my army down.
We agreed to play a slightly bigger game than usual at 2,000 points. I still wanted to play a mostly mono-Codex Death Guard army but was concerned that at that number of points I might meet some tough Land Raiders or other armour. So I compromised a bit and allowed myself to take one Renegade Armiger. It would give me a reasonably speedy unit that could lay down some troubling anti-armour fire that couldn’t be ignored.