For pronunciations, one that always takes me out of a book is Helo (like, "We have a Helo in bound). So many narrators pronounce it Hello (as in the greeting) when it's military jargon for helicopter and pronounced Heelo.
As for worst narrator. One that comes to mind is Ellen Travolta who did some of J.A. Jance's Joanna Brady books for Books In Motion ages ago. It was pretty obvious she'd had no training (or had and was just bad at it), but she would pause in odd spots to breathe or swallow and it just made things feel off. You could also faintly hear her turning pages as she read which is probably more of a general production quality issue than the narrators fault. AFAIK all of those books have been redone and put out by another publisher at this point.
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