Tea should be made in a pot.
If it's 'processed' using a tea bag and mug people tend to squeeze the bag; this results in bruised leaves which causes cloudy tea, ugh!
It takes no longer to make in a pot and tastes completely different. Just ensure that you warm the pot (a dash of water before it comes completely to the boil, tip it out just as the water in the kettle is coming to the boil), have you tea ready. Put the tea into the pot and straight away add the water which should be at boiling point. You don't need to leave it for ages to 'brew' if you've used the correct amount of tea.
The water must be boiling to make tea properly.