Deadly Class is great. My second or third favorite ongoing. You really should get on that.
If you like what Kindt does with Ninjak in The Valiant, then you'll enjoy it. It just isn't as grandiose as some other plots. Actually, it's mostly because it's actually a spy book with some offbeat twists, so it's more akin to Grayson in scale and tone.
I get sidetracked with a lot of Image books, there's far too much quality stuff coming out on a regular basis for me to keep up with my irregular reading schedule. Black Science is another Remender book I need to catch up on it's probably my favourite thing he's done.
Grayson is fun if a bit low key so if Ninjak is like that I should enjoy it. Is Unity worth reading?