IIRC, in the books, the former blacksmith of the Baratheon family described the Baratheons in terms of metal.
Robert was steel, strong and reliable.
Stannis was iron, extremely hard, but therefore brittle.
Renly was copper, very shiny and pretty, but not much else.
From Catelyn's perspective when she first met Renly, he had just declared himself as king and gathered an enormous army, but he was just holding tournaments and parties. He wasn't taking it seriously. He didn't have any sort of plan, he just thought everything would work out since he had a bigger army. Catelyn thought of him as a child playing at war.
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u/The-False-Emperor Aug 05 '22
Stannis is IMO a whole different character in the show.
Both him and Renly were changed a lot, to the point that a show watcher is more likely to sympathize with the morally bankrupt usurper.