Excellent: CX. One particular flight from JFK-HKG had one cup after dinner and three after breakfast. It's THAT good ^

Tolerable: NW. Because I've flown them too often. I guess I just got used to their coffee. But they brew well and it isn't watery or any of that Dunkin Donuts swill.

Qualifies for Vomit: MU. Yeah. I found their culinary aspect pretty bad. I should've really gotten the hint there. Its almost indescribable.

When Shuttle by United was around, their coffee was pretty atrocious too.