Depends on the map. If you have a 485 SPM, this means that you are averaging around 4-5 kills per minute. On maps like Firing Range and Nuketown, this would be about average for a good player. On maps like Crisis and Array, a 485 SPM is pretty commendable.
Yes 485 SPM is very good, but if you got it dashboarding and playing till you get your chopper and dogs then backing out after they are done then no its not.
Its only good if you think it is different players have different standards i.e i would consider that im doing good if im in the top 100 wheras other people try to be in the top 10,000 you should know if your playing well for you
I try to get under 2,500 on the leaderboards. I only got 5,000 with this SPM so I wasn't that impressed because i'm around 7,500-15,000 on all gamemodes.