title_body: Why does a coffee pad machine make such a smooth delicious coffee?
upvoted_answer: The appeal of espresso is the ability to extract, using high pressure, lots of oil within the coffee itself. That isn't easily achieved with any other type of machine.
  
  So for low pressure you can have filtered (anything with paper in between you and the beans), unfiltered (without paper), poured (think drip filter) and full immersion (french press).
  
  The senseo is using a paper filter, removing more oils from the coffee than without a filter and not allowing any "fines" very small coffee particles into the cup. It uses only moderate pressure and it is extracting rather fast.
  
  So these are the variables that seem to create a smooth cup for you. I suggest looking up (or trying) what different extraction durations do to the taste, as well as what the grind size and filter will achieve, both things taht could fill pages ;-)