Good football? That's tricky to define, because it's a combination of moments of individual brilliance and periods of sustained team skill and effort.
But you know it, when you see it.
I also hold to the "old-fashioned" view that good football is underpinned by a spirit of sportsmanship—playing so as not to win at any cost, but with a love of the game itself, a respect for the opposition, and a refusal to cheat in order to win.