Whoa whoa, friendly debate guys ^^
Simba wasn't too bad, but to be fair, the famine/drought ended right as Scar left. Of course, the hyenas overhunted, but the drought also caused the animals to leave. Scar was abusive and horrible to everyone, but I think he was more in love with the idea of doing whatever he wanted than actually running a kingdom. It seemed that he relied on Sarabi to help with that whenever he wanted her to.
Simba prolly needed a lot of help, but the fact that the hyenas were chased away and the drought ended helped his rule a lot.