In my view Marshal is both right and wrong.
When I started roasting I did think that roasting is simple, after 3 years of roasting I think it isn't.
I totally agree that experiencing good coffee is a cornerstone in creating good coffee.
But then, if you don't drink straight espresso you can easily roast for a good cup and if you do espresso then you are in trouble.
My .02 for espresso lovers is actually to start out by reading the How-Tos section (although Jim's paper on Espresso Extraction probably killed the notion of triple espresso). And if you don't really want to home-roast then don't, there are plenty of good roasts out there.
My taking from this thread is that home-roasters need to start doing more roast exchanges.