Black Ops is way different then MW2, I got my first 50+ score in Black Ops last week, 66-18 in Ground War.
Then for the last few days I've been playing some Modern Warfare 2, I've been getting 85's, 95's, 126, 70's.
Got my first 100 in Black Ops the day before yesturday in Grid, 110-23.
Black Ops has definatly opened my eyes on how easy Modern Warfare 2 was, if you can master Black Ops you will absolutely anal rape MW2.
Also, just to bring back the debate.
I'm still able to quick scope, its harder, but not that hard, even without sleight of hand because I don't even need SOH Pro in MW2 to quick scope, I use Marathon.