Is the building wrap providing enough protection for the roof?

I have the opportunity to buy a plot of land with a small house that needs renovation. I would like to do most of the work myself, so I am counting on your advice. The first thing that worries me is the roofing felt on the roof. The house is about 35 years old, so the roofing felt is not in the best condition. The owners emphasized that nothing ever happened, meaning there were no leaks. I am wondering whether it would be better to remove the old roofing felt and install a new one, or if it would be best to use metal roofing. So, my question to you is: Does the roofing felt provide sufficient protection for the roof? What do you recommend in my situation?