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Re:The Complexity of Coffee (2002) [pdf] by barrkel on Wednesday September 14, 2016 @11:55AM (#12498225)
Espresso is generally made with an espresso roast, which is quite a bit more roasting than typical for drip coffee and will burn off many volatile compounds that add a certain amount of complexity.

Accept that different coffees are different.

Re:The Complexity of Coffee (2002) [pdf] by crispyambulance on Wednesday September 14, 2016 @12:06PM (#12498340)
Yes, you're right, roasting and bean have a strong influence. Illy and other specialty coffee vendors also blend beans to optimize the espresso outcome.