Have you ever played the others? AHII is the best simulator I've ever seen. Well, I guess you're on a 1 way road to PNG
IN.
Aces High is probably all you've played then..

IL2 has another series being released called Birds of Prey that will pretty much CRUSH any other WW2 flightsim in every aspect from physics to graphics, including Aces High. There are a TON of other flightsims out there with 10 times better graphics than Aces High..
I think Aces High graphics are kind of behind the times to allow playability on a larger scale with those who have systems that
may be more than a few years old. Marketing bro! Gotta keep yourself open to a large market!
Also, I don't think Aces High is very efficient graphically. Especially on older systems, 2X AA will drop your FPS levels to damn near unplayable. Not sure about you, but I like to play my games cranked to the max when it comes to graphics and I have the system to do so..
From my perspective, if I can't play something that looks pretty, there's no point in playing it. If I had to play COD4 or Crysis at med graphic levels, I'd probably pay my 3 years old to punch me in the face and say "What are you doing papa!!???"
A "simulation" indicates a degree of realism. Graphics enhances that realism..