See my above post. It's only bitter when the beans are burned/over-roasted and they've used water that is boiling instead of off the boil.
Perhaps. I've had coffee plenty of times and I've always had to add cream and sugar due to how bitter it was. I prefer tea. Like some gunpowder green tea from the local Asian market. Comes loose in a tin. Delich. The bagged variety is blasphemy.
I bet that I could make you an espresso or cappucino that you would not need milk or sugar in the the former, or sugar in the latter. It depends on the quality of the beans, the roasting (I use a brand that's espresso roasted), and the extraction.