As a result, even if you are using the same beans, equally fresh, the coffee you brew won't taste quite the same. Yes, the quality of your brewer can make a huge difference to the taste.

Why does my coffee not taste good anymore?

The temperature is too hot or cold

Coffee grounds are very sensitive to temperature and if your water is too hot or too cold, you'll end up with a bad tasting coffee. If you've ever had some coffee and it tasted burnt, it's probably because the water was too hot.

Does a dirty coffee maker make coffee taste bad?

Dirty Coffee Machine

Chances are that it could have become a ground for growing bacteria and that is the reason for the bad taste in your coffee when you drink it.