There is no correlation between intellectual brilliance and enjoyment. Enjoyment and it's obverse, non-enjoyment, is experienced by all beings. To enjoy something, you must first desire it. Human beings cannot eat a meal with the same gusto as a hungry dog. Conversely, a dog cannot understand the enjoyment that an astronomer experiences when looking through a telescope. What is enjoyment to one person can be non-enjoyment to another. There are also people whose enjoyments are the opposite of what most people would consider enjoyment; for example, there are people that enjoy physical pain, and there are people that enjoy mental pain. What we consider enjoyment is not only conditioned on us by our physical birth (amoeba or cat or man), but also by when and where and the conditions in our immediate environment. What foods are considered desirable (and therefore can be enjoyed) are different now then 50 years ago. Same with fashion.
What is considered intellectual brilliance is also relative. You have made an a priori statement that SAT and GMAT etc are correlated with intellectual brilliance. Many of the educational systems in Asia are geared to taking tests. But they do not have the same degree of intellectual originality as a well funded grad student in the US.