Hate hate hate hate hate hate hate them with a passion.
When my BIL met his now wife, her parents would send them out. Somehow my MIL and FIL, her future ILs, ended up on their mailing list. They never asked to get them. ILs mentioned it to us, wondering why they would get them from someone they barely knew.
Now BIL and SIL send them out (since having a child) and we ended up on their mailing list. For the last few years we have had a round robin written by them, but as if it's been done by their child. As if they could write one at a few months old. It is totally cringe worthy, unsolicited, and we generally hated them (round robins, not necessarily the BIL and SIL) before this anyway. No, we don't want to know what you had for lunch every day last year. No, we don't want to know about your holiday in the summer; we saw you not long after and heard all about it. No, we don't want to know... . (You've probably already told us anyway, or we've seen your updates on fb.)
Please, please, please stop sending them to us.
On the other hand, there is one friend of many years who keeps in touch using a round robin that we like receiving. It is well written, informative and just generally like a letter sent at Christmas rather than a list of achievements. So they can continue sending that.