Both Sparrow and Sidewinder missiles are way too accurate in the game and way too maneouvrable.
In reality, missiles of this era are defined by poor reliability and performance - they should only be able to engage targets from the rear, and with limited success at that. This is also the reason why mutliple missiles were used against the same target in hopes of scoring a hit.

Additionally, the Sidewinder seems to lock on to targets automatically (after launch?) even if the pilot himself has not designated and locked a target. Is this intentional? If so, it would be nice to have an audible cue as in real airplane :)