Actually the instructions are via DirectX, so there is little difference on what a dev implements into a code and how that is rendered on a graphics card. The difference is mostly the driver and setup and as such, this is also the best choice to avoid problems: Simply deactivate additional features the graphics card offer, which are beyond the normal scope of DX and rendering instructions, like Catalyst AI, which I've never ever experienced to produce anything positive for any game or application.
On the other hand, it's no real secret that modern gaming-cards no longer support older features for OpenGL and DX. And IL2 definitely IS old. That doesn't change the fact that it's still a good game, especially due to Oleg's prophetic abilities to implement graphical features that were not even supported at the time it was released. But these features are not optimized very much. If you have enabled Effects=2, this will still cause modern graphics-cards a lot of trouble, simply because it's based on stuff that was not available at that time and causes more trouble than it helps, now.
I guess that's the third part of this problem: The state of mind. Just because something is newer doesn't mean it will make things better in all aspects. You can't just plug a Porsche Cayman-Engine into a Porsche 356 and expect that oldie to perform as well as the new Cayman. And then just changing tires won't help it.
After all, limitations like these were the exact reason why Oleg started to build a new engine for SoW.
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