Your thinking is somewhat reductionist. Intelligence is not a black or white issue, it is a character of our species that increases our ability to survive. It's just one of several characteristics that help us in that regard and, like all of them, there is much individual variation.
There's much more to happiness than intelligence. A smarter individual may be better at getting a mate; what happens when they want someone else's mate? In spite of all your intelligence, what happens when you long for something you can't have? Intelligence may help us defend ourselves, but is it intelligence that leads us to war? What some people see as intelligent, others see as a complete lack of intelligence.
It's a huge question and volumes have been written on this and related subjects. For discussion from a scientific point of view, look up evolutionary psychology.
http://www.anth.ucsb.edu/projects/human/evpsychfaq.htmlhttp://en.wikipedia.org/wiki/Evolutionary_psychologyetc.
Here's a quote by Walter E. Requadt:"If we desire to enhance our ability to achieve happiness, we need to rely on our intelligence, our rational mind, to help us understand how life really works. It is inefficient and unworthy of our intellect to hope that, somehow, we may bump into happiness just by aimlessly running around in circles.""We have to use our intelligence and our acquired knowledge to find ore deposits and to mine them successfully. Only if we use our intelligence to understand the nature of happiness, will we have the opportunity to achieve happiness.""A clear understanding of the role intelligence plays in our lives, is an extremely important part our knowledge of how life works and thus, in our achievement of success and happiness."
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