Aros can run classic games with amibridge just fine, at least in my experience...
UAE integration is almost working and soon classic programs will be running just fine, really seamlessly in an aros window. Soon you won't even notice any difference between a native aros program and an amiga classic program running in an aros window.
Its going to be sweet once sound and a joystick is working, which I hope should be soon. - Personally I can't wait to play star control in an aros window...
Besides uae integration, DOSBOX also works nicely under aros, so your every retro game dream machine is almost here.
Steven