After having read Kevin Smith's Green Arrow (Quiver) and totally loving it, and being a major fan of Frank Miller's Daredevil from its original appearance in the 80s, and also being a fan of Kevin Smith movies, I was really looking forward to Guardian Devil. However, I was severely disappointed.
Guardian Devil is horribly overwritten - it should be a novel, not a comic book. But even as a novel, it would be pretty boring. The problem starts right on the first page, with a letter from Karen Page to Matt Murdock that goes for two pages, spliced up with no consideration for the content of the letter or real relevance to the background scenes of Matt Murdock and NY. As if that weren't bad enough, it then jumps to the next story element, using the narration boxes again, with words that far outstrip the images. Later on, a fight with demons from Hell is tamed down by dialogue boxes larger than the action sequences. Ho hum.
As for the story itself, it's just too dopey and never really all that believable (OK, it's a comic book, I know, but it didn't have a satisfying internal logic).
The drawing style is uneven. Its strengths are the cool action-lines made by DD and his weapon, a kind of replacement for Frank Miller's shaded-repetition to show motion. And the splash pages are awesome - art nouveau constructions that are as elegant as they are playful, especially the one with Dr. Strange.
The artwork's weaknesses are that almost every visual element is equally weighted and it all ends up just right in your face without much depth or subtlety. To add to the lack of subtlety, characters are very cartoony, with giant heads and stick-figure bodies, as if this was DD-junior or a Marvel-Heroes action figure collection for kids. Major shake-ups occur in Matt Murdock's life, but they don't make a big impact due in part to the cartoony drawings, which don't suggest anything major is going on in the story.
Sum: for Kevin Smith fans and completists only; otherwise, skip it and pick up with Parts of a Hole, which, despite having the same art team of Quesada/Palmiotti, manages a much better job with a way better storyline. Or, check out Smith's Green Lantern Quiver, from Marvel's "distinguished competitor," in which both the writing and art is clear, clean and sharp.