By "luxury wonder", I basically mean a wonder that is impossible or extremely improbable to build on higher difficulties (Immortal, Deity) without deviating too far from the fundamental research path that is necessary to keep pace and win at these levels.
In my opinion a lot of people have overrated this wonder a lot. You have to rush currency to get it (which is not on the way to education). The yield bonus it gives only applies to tiles that are already completely useless by themselves (desert).
What are you going to do with a bunch of tiles that only give 1 food and 1 hammer? That is still useless terrain, the same as an unimproved plain. The fact that you'll get an extra 1 faith from each desert tile doesn't change the fact that you will reach stagnation or starve very quickly.
If this bonus applied to flood plains as well, then I might change my mind about this wonder.
The 6 culture per turn after archaeology and the extra trade route are nice bonuses, but obviously the main feature of the Petra is the +1 food and +1 hammer.
The only way I can see this as being a worthwhile bonus is if combined with the Kasbah. And even then, your desert terrain would depend far too heavily on having the Petra to be of any use to you.
In my opinion a lot of people have overrated this wonder a lot. You have to rush currency to get it (which is not on the way to education). The yield bonus it gives only applies to tiles that are already completely useless by themselves (desert).
What are you going to do with a bunch of tiles that only give 1 food and 1 hammer? That is still useless terrain, the same as an unimproved plain. The fact that you'll get an extra 1 faith from each desert tile doesn't change the fact that you will reach stagnation or starve very quickly.
If this bonus applied to flood plains as well, then I might change my mind about this wonder.
The 6 culture per turn after archaeology and the extra trade route are nice bonuses, but obviously the main feature of the Petra is the +1 food and +1 hammer.
The only way I can see this as being a worthwhile bonus is if combined with the Kasbah. And even then, your desert terrain would depend far too heavily on having the Petra to be of any use to you.