If you have a mid to high range PC then playing at 1920x1080 should not be a problem. I can run it pretty well except when flying over London, there the FPS is still playable but I wouldnt want to dogfight like that.

I have to disagree with the statement some make about not needing AA in a game if you set the resolution high enough. Even at 1920x1080 there are still alot of jagged edges especially on aircraft at medium/long distance. Personally if I see jaggies in my games I feel that I've just wasted alot of money on a PC and might as well just play on an XBOX...4x AA is a must for me.
Anistropic filtering is nice, but the effects of this arent as noticable as AA is and I can live with that on 4x or even off if it has some performance gains.
AA doesnt seem to work with CoD right now so there is no choice but to deal with it. Alot of the people complaining about FPS on these forums seem to have really dated hardware and I have no sympathy for that, get a job, make some money and keep your system up to date if you want to play the latest games with the eye candy on.

However, there are also alot of reports of low FPS on high end systems as well so hardware cannot be entirely to blame here. Considering how many things are actually broken in this sim I am not surprised at all to find it poorly optimized. This is the way of the industry it now seems. For me the game is very playable on all medium settings, with high model and damage decal settings. My specs, while not killer, are mid range.

Gigabyte 790XTA-UD4 Motherboard
AMD Phenom2 965 BE Quad@3.6ghz
8GB ADATA gaming series RAM@1333 CL9
ATI 5770 Vid card by Asus
1000W bronze PSU
Asetek 120mm Liquid CPU cooler Push/pull
AZZA Solano Full tower w/9 fans including Kingston RAM cooler
Some Green, Red and Blue LED lights to make everything pretty