PC's have "pretty" screens as well but if you ever have a problem the wall-of-text will come up instead. Much more useful.
We tried using mac minis as little servers, but they wouldn't boot if a monitor is not connected. We got around it by making a dummy DVI connector with a resistor in it. But still, it is jumping through hoops. That and the silly BIOS, it is as if Apple went out of its way to make it less user friendly...
Mac minis are fairly different depending on the generation.