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well you can't really compare cs scores since it there are so any factors that affect your kill:death ratio. You have to take into account who is playing, , how many people in server, their skill level, teams, everyones ping, your ping, server location ,your fps, everyones computers, CHEATING..., your kills/minute and everyone elsed kills/minute... etc
You get my point??? This list could go one for awhile, but anyway, i can't really give you my best cs score because there are time where i'v gotten 103 to 12 playing newbies and 40 to 13 in more balanced games. I will say that i don't stay in servers more than 30 mins and my kill death ratio is usually around 3 to 1 or at least 2 to 1. It can go higher or lower.