Why Google Groups Sucks

To be fair, the article is about the pros and cons, but you can skip the pros and just get to the cons.

The maintenance required for grouping our friends is too high and too vague. We simply don’t have the rules as clearly defined as programs require and even if we did, the parameters change. Your personal tastes change. The influential people change. Even your friends change. Keeping the groups accurate and remembering its members is a challenge.

I've still yet to a see a technology emerge from these "groups" and "friends" that is superior to the group email.