All computer games are unrealistic... just a matter to what degree.
In general, the Jane's games are designed more for gameplay than realism (except F-15 and F/A-18). I bought WW2 Fighters after I had already been playing Aces High. The graphics were fantastic complete with spent cartridges falling into the airstream and the sound was great too. But having gotten spoiled by AH FMs, I never really played WW2F much. Fighters Anthology on the other hand is still one of the best survey jet sims in terms of flight models when the user libs (like 714 libs) are used. However, its graphics and details are so dated that it hurts my eyes to play it. USAF was the other way around... graphics quality that is just now being surpassed that ran great on low end machines, but atrocious flight models.
"realistic" or not, the Jane's games usually offered a lot of variety and great playability. All of them have been well supported by user mods.
I still like the shape of the AH P-51 better than any WW2F mod. While playing AH, I don't notice the polygon faces too much, but the mishaped nose and canopy of WW2F bothers me a lot.