I'm a Sapphire with oneworld via Qantas and have been for several years now...

* A lack is the Africa network. I know oneworld are aiming for profit, and that is quite fine, but I think an African airline needs to be added.

* Strangeness is where some oneworld carriers use third party lounges in cities where other oneworld airlines have lounges. This doesn't make any sense to me

* A great thing is that the alliance is small, number of airlines wise. It's allowed almost all the airlines to have a similar product offering, with good safety records, and good service.

* A bad thing is where you go to the CX J lounge in BKK as a QF card holder and are told to go across to the QF lounge, when in reality you should be permitted in (this has happened twice)

While not perfect, the alliance is very good. I've flown some Star Alliance airlines (TG J, SAS Y, BD Y) and not really had the same impression of cohesive service that oneworld appears to have.