Im wondering if there's going to be another round of optimisation before release. I'm running a Q6600 @ 2.4Ghz, 4GB RAM and an HD6870 on 64bit Win7. Monitor is a 22" @ 1680x1050. I can run Crysis: Warhead on it's maximum settings very smoothly. RO2 runs at about 40FPS but drops in places, and stutters like hell when there's an artillery barrage.
I know Crysis is an older game, but it was also famously strenuous for computer hardware. I would have thought that being able to run it at maxmimum settings would be a good indication fo the ability to a game like RO2.
However, that said, I consider anything about 30FPS as good and eprfectly playable.