My roommate constantly has a cup of coffee in his hands at home. He can certainly appreciate a nice blend at a fancy coffee place, but is also more than used to the brown sludge from the teacher's break room at school. Honestly, so long as it's hot and caffeinated, he's good to go.
Threads pop up on the boards from time to time saying how awful the coffee is at WDW unless you get it from one of a few special places. He didn't find this to be the case, though. He enjoyed the coffee at Roaring Forks, the counter service location in the Wilderness Lodge, just fine. We opted for the refillable mugs on our first day, and he certainly got his money's worth of coffee during the week. (I don't touch coffee, myself, but my mug got a good deal of use at the soda fountain.)
I guess what it boils down to (no pun intended) is how big of coffee connoisseurs your friends are. Is it more important to get a gourmet cup of coffee even if it means going out of the way to find it, or are they just looking for a convenient cup of joe to get them moving in the morning?