Those who view Faustus's damnation as tragic argue that he is a complex and sympathetic character who is ultimately undone by his own flaws. Faustus is a brilliant scholar who is driven by a thirst for knowledge and power. However, he is also a proud and arrogant man who is willing to do anything to achieve his goals, even if it means damning his soul. In this sense, Faustus is a tragic figure because he is ultimately destroyed by his own ambition.
Others argue that Faustus's damnation is an act of justice because he willingly chooses to make a pact with the devil. Faustus is fully aware of the risks involved, but he is so desperate for knowledge and power that he is willing to take the risk. In this sense, Faustus's damnation is a just punishment for his sins.
Ultimately, the interpretation of Faustus's damnation as tragic or an act of justice is a matter of personal opinion. There is no right or wrong answer, as the play can be interpreted in multiple ways.