I'm a big fan of the mixed kit. A jersey should never match the shorts (unless it's a race).
Anyone who rides with a full team kit is a massive carrot for all other riders. And anyone who has been a carrot knows how much that sucks. It can turn a casual training ride into a lung busting, blood coming out of the ears, kind of a ride.
Catching someone with a full team kit can put a smile on your face for days. Only slightly less satisfying is catching someone with baggy shorts and knee socks.