In pandorax he pretty much tells the dark angels that no one cares about their stupid secret (not that it stops them form blackmailing them into doing what he wants)
mortarion heart was pretty good Draigo pretty much gets elected sgm because he was simply the best swordsman available and he him admission he's probably going to die and only wins thanks to knowing mortarions true name
And ward hasn't been bad since necrons his high/dark elves and drawers rule books are really good and balance and made a few fans form the eldar player based (more so since Phil Kelly admitted ward helped him on the eldar codex)
And sentinals of terra was great even makes a few jokes about the ultramarines
Even if he carries out acts of valor that make sanguinias look like a push over and despite being one of the most "Mary sue" of all warhammer characters you still made him look badass, and I love the hint at daemonic influence along with beautiful armor and warp design, awesome.
Seriously though this guy has plot armor thicker than a titans ceramite armor.