IL-2 is a game that deserves it's place as a classic of flight-sim games, a milestone of advancement in quality of flight sim games, and the best WWII flight sim game ever.
There are a few noticeable glitches: some aspects of the FM are weird, wild or exaggerated compared to AH.. and the IL-2 community is.. well.. I'm sorry to say generally full of dorks(since IL-2 was an unexpected success that drew a lot of attention from people that haven't been interested in flight sim games before, the topics and attitudes in IL-2 boards are just plain silly most of the times. While it's understandable, it's still boring...)
However, gunnery, while it is a bit excessively increased in difficulty due to wacky trim functions and super sensitivity towards stick configurations... as a whole, is the best I've seen. "Get in close, than get closer" is a word which really has some meaning in that sim.
The damage model is simular to AH, or any other kind of air combat sim for that matter... but the damage levels are gradual, and it is visually represented. Another important thing is IL-2 models the difference in the quality of the rounds fired hitting the target. A grazed hit and a direct hit differs greatly in the level of damage they do, and this goes for all the weapons, including 20mms and 30mms. While sometimes this method brings out quirky results(like 30mms doing almost no damage from time to time..), generally it is more convincing than the AH model.
The FM is also excellent. The planes handle very simularly as in AH, but however, my impression is that the E-loss is a bit high in maneuvering. Thus, planes with better engines and better turn capabilities tend to have a noticeable edge over planes that mainly engage in a cautious, E-wise manner. (The blasted Yaks and La-5FNs..) One problem is the high-alt FM is haywire, and the producers admitted it.
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All in all, it is a must for people who enjoy WWII air combat games.