It depends entirely on the Palestinian Refugee Camp in question. It can vary from undesirable to intolerable to unlivable to attacked by state actors.

Deplorable is probably a good place to start.

Palestinian refugee camps were established after the 1948 Arab-Israeli War to accommodate Palestinian refugees who fled from the war.Refugee camp for Rwandans locatedin what is now the eastern Democratic Republic

There were numerous Palestinian Refugee Camps that were involved in the Lebanese Civil War. One of the darkest moments of the Lebanese Civil War was when the Israeli military assisted the Christians Falangists massacre the Palestinian Refugee Camps of Sabra and Shatila.

The Refugee Camp at Jenin has been attacked several times when Israeli Soldiers are trying to attack or hunt down Palestinian Militants who live in the camp. However, the Refugee Camp at Jenin continues to be one of the largest Palestinian Refugee Camps in the West Bank.

Lebanon, Syria, and Jordan.