Fun aggregation: essentially, "The Best of [everything] - 2015" ranked according to number of mentions on critic's year-end best-of lists. You could probably go further with it, ranking according to average placement on lists, but for CoC purposes, this is more than enough info:

Top Threes

Movies:
Carol - 82% of lists
Spotlight - 77%
Inside Out - 73%
Mad Max: Fury Road - 73%

Television Shows:
Master of None - 83% of lists
Fargo - 83%
Mr. Robot - 75%
Mad Men - 75%

Books:
Between the World and Me - 80% of lists
A Little Life - 60%
The Story of the Lost Child - 60%

Albums:
Kendrick Lamar, To Pimp A Butterfly - 100% of lists
Vince Staples, Summertime ’06 - 63%
Carly Rae Jepsen, Emotion - 63%

And just for fun, because we at the WGOM are so hip, tied for fourth place are few the Citizenry crowed about this year:

Courtney Barnett, Sometimes I Sit and Think and Sometimes I Just Sit - 58%
Joanna Newsom, Divers - 58%