Crucifixion was a most disgraceful and most brutal manner of capital punishment. Assyrians and Babylonians started it and Persians developed it in the sixth century B.C. Romans perfected and used it until the Christian Emperor Constantine I abolished it in the fourth century A.D. According to Deuteronomy 21:23, anyone who was hanged on a tree was a curse of God. Jesus became the “curse” for us sinners.
Jesus humbled and suffered for us to the maximum extent possible. Unlike us, he was free from original and personal sin. How can we complain to God for our less sufferings compared to that of Jesus?