We had this discussion before, but here is the highlight again of the mistakes made by the Argentinians:
1) Did not know how to properly use the bombs. Many hit the target but failed to explode because the arming mechanism were not set correctly.
2) All the torpedoes fired by the Argentinians failed to explode due to wrong wiring (done by the Argentinians). Had they not committed this elementary mistake, they could have ravaged the British task force.
3) Improper dog fighting. The Argentinians repeatedly tried to engage the Harriers on their element (low altitude) instead of trying to bring the Harriers to fight on their terms.
4) Not moving high performance planes to the Falklands, instead forcing them to operate from the continent
5) Not properly securing the Pucara planes that were in the Falklands. Almost all of them were left unguarded and destroyed by the SAS.
6) Keeping the entire Argentinian surface navy inside the port.
7) Exposing the Belgrano the way they did, FOR NO REASON and NO PURPOSE whatsoever.
The Argentinian side of the conflict is full of 'If they only had done X". That to me is symptomatic of what we are talking about. They had all the tactical advantages and lost because they made poor decision and mistakes.
I do agree with you about the Exocet. It was such a formidable weapon at the time that, if the Argentinians only had more of it (here it is again), they could have changed the outcome of the conflict, despite all of their other short comings.