Any K/D above 1 is a good ratio. That means you have more success than fail, and thats basically a good feeling. Above 1, everything depends on your style, and on what is fun for you. For an example, vDALLAS. He always flies doras, comes in high, picks and pulls up as high as he can, and has a K/D of 2. I have the same K/D ratio flying the g-6s low and without SA. And Krupinsky or Pervert has about the same K/D altough they beat me in 1v1 7 of 10 times.
So dont care about the score, it shows nothing. Just have fun!