Dunno if this has been covered, but I've seen a lot complaining about the AA, or lack of it in RoF. In case you've never heard of it, Nhancer is a great program that will allow you to override the application's AA, AF, and other things (including SLI, I believe). Of course, this program is only for Nvidia cards, but there's a similar program out there for ATI cards too. Make sure to READ the directions and skim over forums (start with some MS Flight Sim forums) on how t get this very powerful program up and running. It's easy and I've been using it since FS2002. Good luck!

EDIT: I should add I don't have to use Nhancer for RoF, my graphics seem to be perfect for me without it.