I think you will have to do your own research and come to your own conclusion. The MEO ASX releases are a good place to start and can be found on the MEO website.
This extract from the 2010 annual report is it pretty much in a nutshell.
"Although there is still significant risk with the Artemis prospect which only drilling can resolve, we have confidence in the technical skills and judgement of our exploration team. Accordingly, MEO acquired an additional 5% interest in WA-360-P in mid-2010, thereby increasing our participating interest to 25%."
FWIW I believe a company like PBR is not apt to farm in to an average prospect on new country entry. Of all the farm in opportunities Australia wide, they selected Artemis and voted with cash.
I have substantial holdings and had planned to offload half during spud, but since PBR came on board with the substantial terms agreed upon, I'm holding for the TD results. I might regret it but I won't get anywhere without taking risk.
MEO Price at posting:
52.0¢ Sentiment: Buy Disclosure: Held