so true
And I usually have catapults before the big chicken is built.
Hagia Sophia is situational, but I built it often. It comes in a time where I have no better wonders to build, and I'm often in the mood to get one or 2 of those shiny things

.
One I very rarely build is the pentagon.
Of course it's great to have 2 XP for every troop you build. But by the time this wonder is available, I have most of my troops already built (and most of the time, the game is over already = either I'm in a good position and I don't need it, or I'm in a bad position, and 2 xps won't help me much!).
I rarely come to this tech if I'm not aiming at space, and if I'm aiming at space, I won't be needing that many highly promoted units.