I'm not knowledgeable about narrators and audiobooks in general, but some thoughts of those I've heard this year.
Jim Dale 5/5 for Harry Potter series (other than the first book, I didn't listen to it - the most enjoyable audiobook experiences I've had).
Kate Mulgrew is very good with NOS4A2, 4/5
Trevor Noah's Born a Crime really does seem like a long conversation, well done, 4/5
Edoardo Ballerini is well-cast for the Matthew Corbett series from R. McCammon - he's slower paced but well seasoned, something about his quiet tones draws you in. 4/5
Tom Sellwood is doing brilliantly with The Terror by Dan Simmons - he has a knack for switching voices with viewpoints convincingly well, he's not too slow or rushed, enjoying this narration very much. 4.5/5
Matt Godfrey does a good job with the Blackwater Series by Michael McDowell - not always perfect but his pauses in voices and conversation make picturing the characters and their mannerisms easy. He fits the stories - I do wish he'd pause more or change his tone a bit when it's supposed to be a "creepy moment". 3/5
The Chestnut Man with Peter Noble - Didn't care for at all. He has the bad habit of pausing in several places in each sentence, and not always where he should. His voice impersonations aren't bad, but he keeps it slower and pausing, it's easy to get out of the story, and some odd dialect. 2/5
If you ever get a chance to hear the old Perry Mason's, they have most of them on Scribd, I highly recommend one of the most used narrators - I love listening to this guys voice, fits the noir vibe with some of these, and sometimes the voices are a hoot. 5/5 on the Perry Mason series, not sure what my rating would be with other genres.
Alexander Cendese. I haven't heard him do any other work besides Perry Mason, but looking at his page he seems to do a lot of romance.
Steven Webber does excellent with IT - I would go all the way to 5 stars, but he gets a bit understated and odd when it comes to the voice of the clown. 4.5/5