Nescafe is only served at the drink station. Ground and brewed coffee is served in the dining rooms and by room service. I've always found this coffee to be quite good.
Despite the many arguments that Disney has an "exclusive" agreement with Nestle and only serves Nescafe, this is simply not the case. While many "quick service" locations at WDW do indeed serve Nescafe, many places serve other types and brands of coffee. The sit-down establishments usually serve higher quality, ground, and fresh-brewed coffee. And many serve speciality coffees. For example, Kona Cafe serves true, authentic Kona coffee.