It's an amazing place. People usually focus on the breathtaking Treasure building because...well, you just need to see any photo.
But Petra is a huge complex and there is much more to it than just the Treasure (tombs, temples, great trekking trails...). We spent 2 full days there, because otherwise you just need to focus on the main sights (Treasury, Monastery, Royal Tombs).
In Petra's case I believe the inclusion within the wonders of the world is well deserved, so I would recommend it to anyone. That said, be prepared to walk A LOT and reject offers to buy something from the Bedouin local people every few steps.
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