Comment Coffee percolator (Score 2) 270
I've had better coffee from a coffee percolator than from a K-Cup. It's simpler too, if you have one with a mesh screen you don't need filters and easily rinses out if you don't leave the coffee in it all day. Else you can scrub it out with a long handled brush when it starts smelling like old coffee. (for me the percolator coffee seems to do the best job at high altitude, start boiling at about 92C for me)
Since K-Cup's can't make espresso (not enough enough pressure), no need to compare it to a proper espresso machine. It's simply an elaborate drip coffee maker. A $30 Mr. Coffee from Costco will also make a fine drip coffee. You can use expensive unbleached compostable paper filters if you want, they're still a few percent of what each K-Cup costs.
My compost pile loves used coffee grounds.