I've audio read this one back to back with Hogfather and it doesn't hold up my former 5 star rating. I guess it's due to the storylines being so similar. It was just too familiar how the life force creates embodied curses and the belief creates minor "gods".
Having said that, it's complaining on a high level, since I've read it for the fifth time now. So it's by no means anywhere near bad or mediocre or anything other than great on a normal reading scale. Just not Pratchett-perfect.