If I ride in a group I like to ride with two or three friends that I know well. Every now and then a group of five of us gets together to ride. We all know each other and our riding styles and abilities so it works well. I've learned not to ride in any larger groups or with more than one or two other people I wasn't used to riding with.
When I have ridden in larger groups (anywhere from 10-20 riders) after an hour or two I got so frustrated with the slow pace/dangerous riding/constant stopping, I told the ride leader it wasn't working for me, have a nice day I'll be taking off on my own.
Of all the things I've lost, I miss my mind the most