Your info is right about google adwords and yahoo search marketing.
The ad copy review is more easier in yahoo as you have different ad copies for all keywords.
If you want to make just one ad copy than select the option while adding keywords which says single title, description and destination url. You will get all the ad copies same.
In YSM you can see the performance of a keyword and if you feel that the performance of a keyword is not good bcos of the ad copy you can actually change the copy than and there. It will take 3-4 days for review if it is a competitive keyword. Otherwise it will take less time to get changed.
If anything more I can tell you please let me know.