The series in question is the Dresden Files by Jim Butcher, read by James Marsters, If you're an audiobook fan, I also recommend looking into GraphicAudio. Unabridged audiobooks with a full voice cast, music, and sound effects.

The Night Angel trilogy by Brent Weeks is good in GraphicAudio, as is Warbreaker by Brandon Sanderson. Warbreaker is stand-alone, so it may be a good starting point.

There are a few rough bits, but there always are; some sections with awkward musical choices, some re-used recognizable sound effects, but they're no more common than errors in standard audiobooks.

(Disclaimer: GraphicAudio books are abridged, but functionally unabridged. If it's raining, they play the sound of rain instead of having the narrator say "it was raining". By definition, that makes them abridged, despite no loss of content.)

Based on dlytle's description, he's likely talking about the Dresden Files series.