Robert was the worst of them, yet he was the one who could be king at that time.
Renly would be best in Spring and early summer, when times are good. When no foreign threat emerges. When the people enjoy a light hearted, fair, and reasonable monarch.
Stannis for late summer and autumn. When times are about to be tough. Or when an existential foreign threat emerges. A king who will do what's right without concern for whether the people love him or not.
If only they could "lead as two kings! Yeah, we'll f$&@ing lead as two kings."
Intelligence isn't the black-and-white attribute that many believe it to be.
There are many branches of intelligence.
The absent minded professor or socially awkward scientist are easy examples. Some people have a well developed intuition on how to deal with different types of people, while others are excellent in discrete dynamic systems. Still others have an intelligence branch that favors learning multiple languages.
Victorion seems to have little capacity for political thought and relatively poor emotional intelligence, but there is an intelligence to fleet management and even martial prowess. He may be good at geometric understanding or have the capacity for blackjack. Who knows?
Gold is money in ASOIAF, much as in most of our world's history.
It's mentioned frequently, because it is ever present. One pays for everything with Gold or Silver.
Look hard enough, and you'll find plenty of positive references to gold as well. People buy food with it! Food is good! Jon ensures Sam has gold to make the trip to the Citadel! Gold is friendship! Drago kills viserys with gold, and Viserys was a prick! Gold is Justice!