Are there ANY good recommenders?

This week, I got an excellent question from a reader (keep them coming!).

Paul writes,

Following up on your two posts about recsys I can imagine that you receive a ton of replies aiming to point out the value of recsys and trying to refute your arguments. I would love to hear these other voices, or instead some kind of meta post contemplating your position on Netflix and what others say about it.

Surprisingly I haven’t received ANY replies arguing that the current state of recsys is good, so I’d love to open it up to readers.

So, what are the *best* recommender systems that you’ve encountered either at work or at your online lives?