Rapier had its fair share of mismanagement during the Falkland War.

- Blindfire radars were cleverly left in the UK, caused by logistics.
- Second line repair equipment was left on Ascension (all optical tracking repair vehicles).
- Planned practice firing at Ascension was cancelled.
- Rapier SAM sites were located on hilltops, so they had to shoot downwards.
(same mistake as the Syrians done in the Bekaa valley)
- During Argentine attacks, there were so many British Helos around, that IFF was always RED.
(they had to rely on visual ID only)

During the conflict, 61 missiles were fired, and killed 1 Dagger-A (Grupo 6, Rio Grande, C-436, Teniente Juan Doming Bernhart, killed during ejection).
(25% of missiles went out of control after launch, and 60% were launched as deterrent - out of range)

In my opinion, Rapier was a capable system...
... but was stripped from its radar, and maintenance, plus were mismanaged badly during the conflict.


To be on the fair side:

British

Blowpipe - 95 launched - 1 MB-339A killed
Rapier - 61 launched - 1 Dagger-A killed
Seacat - no kills
Sea Dart - 7 aircraft & 2 helo kills
Seawolf - 3+1* kills *(crashed during evading)

Sidewinder AIM-9L - 26 launched - 19 kills
Aden 30mm - 4 aircraft & 4 helo kills

Argentine

Oerlikon 35mm with Skyguard - 1 Harrier FRS1 (800Sqn, HMS Hermes, XZ450, "50", Lt N Taylor, KIA - no ejection)
Roland - 1 Harrier FRS1 (801Sqn, HMS Invincible, "08", XZ456, Lt I Mortimer, ejected succesfully)