I would like to invite views from other CHF members on this character.
It was through reading comic version of 《三国志》 (SānGuóZhì - Chronicles of the Three Kingdoms) that I first read that Líu Shàn (刘禅), the successor of Líu Bèi (刘备) as ruler of the Shŭ-Hàn kingdom (蜀汉) from AD 223 until its demise in AD 263, that I encountered an interpretation of the character as someone who was intelligent.
In the comics, it showed Líu Shàn growing up well as a teenager, developing his skills on horseback archery etc. However, he soon encountered a delimna about his future role - and sank into depression. Zhūgé Liàng (诸葛亮) had to console Líu Bèi that it was a sign of early maturity and if the boy could breakthrough his delimna, he would soar to great heights.
Unfortunately, in the comics, Líu Shàn was unable to breakthrough and became a passive ruler, and coupled with a pacifist nature, was of no help to the kingdom in terms of reviving the Han Empire.
Two wikipedia's article on the character described him as a shrewd person.
http://en.wikipedia.org/wiki/Liu_Shanhttp://zh.wikipedia.org/wiki/%E5%88%98%E7%A6%85Unlike the portrayal in Romance of the Three Kingdom 《三国演义》 who showed him as mentally inept and weak-willed, Líu Shàn was supposed to be able to keep the Court on an even keel, balancing the expansionist efforts against overburdening the people.
His infamous “此间乐,不思蜀” was supposed to be feigned to make Sīmă Zhāo (司马昭) consider him as posing no threat.
While Zhūgé Liàng was alive, he was unable to veto the military campaigns against Wèi (魏), the articles went on to say that Líu Shàn lacked the confidence after Zhūgé Liàng's passing to halt the expeditions.
One view was that Líu Shàn could have established a more long-lasting Shŭ-Hàn kingdom if the state had not exhausted itself on earlier campaigns.
Another view was that it was small but fatal error in military strategy that enabled the Wèi to conquer the Shŭ-Hàn : otherwise, the tripartite balance might have continued for generations.
However, there was also no denying that he was only able to keep a lid rather than resolve the divisions in his Court, thus limiting the effectiveness of the government.
His trusting the eunuch Huáng Hào (黄皓) was also blamed for the weakness of the government, though others interpreted it as merely a power struggle against Jiāng Wéi (姜维). But power struggles had fatally weakened a state before, so it was no excuse.