Sadly, I cannot give more than a star. The place w...

Sadly, I cannot give more than a star. The place was robbed of its spirituality, its devotees, its soul. All that remains is an empty carcass, a gloomy place, not a church and, by all means, not a museum.
I am not surprised by the number of negative reviews. They are right, there isn't much to see. If you take Hagia Sophia out of its historical and religious context, all that remains is just a building.
In order to get the 'spirit' of the place, one has to have knowledge of the historical facts and the capability and the will to imagine and to silently reconstruct them, as they happened in and around the church.
This place has for centuries absorbed intense feelings from generations of people, the people of Constantinople.
There they prayed, there they watched their rulers being crowned, there they seeked refuge and inside there they were sometimes massacred. Awe, pride, grief, pain, terror, hope, all this accumulated within its walls. The Roman emperors, the Greek patriarchs, the iconoclasm, the split of the churches, the rift between eastern and western churches, the slaughter and destruction by the crusaders and the final siege and occupation by the Ottoman Turks.
A church is void without its believers. Visit only, if all this has a meaning for you.