Speaking for music best-of lists, as compiled from votes of critics: I've found these lists are not very helpful in finding music I actually care about. It's frustrating, because there seems to be so much utility there.
I've explained it like this: To get on the list, something has to be considered at-least-good by a lot of people, and this tends to reward (1) herd mentality; (2) lowest-common-denominator. The list selects against anything in any niche, even when it's excellent.
As I look back through music that has meant a lot to me, there is just not much overlap with best-of lists.
Note: I'm talking about critics-vote, pooled, best-of lists. Single-critic best-of lists don't average out niche tastes and, for the right critic-listener match, can be very helpful indeed.