I'm curious what everyone is talking about, I'm also on Mac, but I haven't noticed anything unusual about the scroll. It might have lagged a little bit initially (not really sure), but other than that it seems to be functioning normally for me.
If you have to scroll, and are on a Mac, it will drive you mad. :)
Maybe this is related to the so called "natural scrolling" feature on Mac? I don't use that because I find it completely unnatural and it drives me nuts, so maybe it only causes that issue if you have that feature enabled?