It's also partly us playing the same mission many times. In reality, SAM crews got only one chance.

Also, the way aircraft try to dodge missiles is very limited. In reality the US had specific manouvers to avoid missiles, but in SAM Sim they either dive or just fly straight.

And the jamming used in SAM Sim is also limited. They only use noise jamming. If aircraft used modulated noise jamming, like in reality, it would make hitting targets much harder. And they don't drop chaff.