I love the Keurig, used it every day for nearly a couple years now. But I always use the MyKcup reusable filter.
Then its just the cost of grinding your own beans, of which is use a good old fashioned hand crank burr grinder. Freshly ground beans is far more important than any of the other steps.
Always perfect temperature (just a few degrees under scalding), slight pressure, but not as strong as an expresso press.
One of the best purchases ever.