Considering that virtually everyone in India is a cricket fan and many of them are ignorant (to put it nicely), it's tough to claim that cricket fans are the most intelligent. That really doesn't make much of a difference because the type of people who follow a sport is often influenced by cultural, geographical and social factors. In my opinion, you have to analyze the nuances of the sport objectively.
By that standard, cricket is a very cerebral sport. Batsmen use timing, placement and precise footwork far more than power; bowlers use various types of swing, cut, seam, spin, variations in pace, lines, lengths; tactics come into play with field placements, bowling changes and much more. I could go on and on. Another cerebral sport is (american) football, despite the notion that it's all about power, ferocity and knocking the crap out of the opposition. I've played soccer (football), tennis, basketball, baseball and more but cricket is the cerebral sport IMO.