In the story, an officer describes an ongoing war between humans and aliens. The aliens have less advanced technology so they assume they will easily when. However, the officer remises on how much of the new technology used in the war was unreliable and could not be produced in high numbers, and some even exploded and destroyed their own spaceships, leading to humanity losing a war of attrition. The story was very short, 20 pages at most, and part of some collection/anthology, and released before the year 2010.
This is, of course, Arthur C. Clarke's 1951 classic "Superiority".
The story is written by the surviving general of the defending forces as a letter to his captors, explaining why he cannot vouch for his actions if he's required to continue to share a cell with the enthusiastic but utterly clueless head scientist.
It appears to have been among the first questions asked on this site.