I think what made the IDW comic about Shining Armor and Cadence work was the reaction of the characters. Very exaggerated and very expressive, but not obnoxious and in service of the story and the character contrast. I think these little details made the story work. It’s not specifically what the story is, is how you tell the story. Because of that, that comic is very good.
I still haven’t read everything about IDW. I’ve read the “Twilight Vs Chrysalis” comic, I’ve read the comic where Luna takes Celestia’s place in order for her to rest, I’ve read the story about Twilight’s favourite writer (this one is my favourite), I’ve read about Pinkie Pie’s favourite clown, I’ve read the Cadence romance story… but that’s it. I think I’ve stopped reading these in 2015.
EDIT: And I think I’ve read the one where Big Macintosh thinks in monologues.