Taste is subjective, and there are many variables in coffee prep that affect different aspects of it. Grind size, roast level, brew temp, brew time, brew method

Taste is subjective, and there are many variables in coffee prep that affect different aspects of it. Grind size, roast level, brew temp, brew time, brew method, etc will all cause variations in the taste, some quite large. You also have different variables in the taste itself. The sweetness, acidity, bitterness, earthy flavors etc. There is also the feel of the liquid, based on the amount of suspended soluble material and oils. What causes the differences is primarily that different chemicals are present in the coffee, and more are created in the roasting process. Those chemicals all have slightly different rates in which they will become soluble based on temperature and pressure. A finer grind, higher temperature, or longer brew will all result in extracting more of basically everything, some of which might taste unpleasant to you.