I can\'t understand the virtues of using XML comments. I know they can be converted into nice documentation external to the code, but the same can be achieved with the much
You don't have to use them in your projects.
They are a standard that happens to be integrated into Visual Studio and if you use StyleCop they can be enforced. So this is the virtue here.
However, if you decide you want to use DOxygen then there's nothing stopping you. Just make sure you are consistent.