Dinosaurs reigned on Earth for 200 million years. Homo Sapiens Sapiens has been around for two million years and dominant only for the past 10,000 or so. There is no evidence big brains are a better survival adaptation than big teeth or the ability to scurry about in the dark and eat dead stuff.
That idea has always bugged me. Dinosaurs are a superorder (Dinosauria), whereas humans are a species. Comparing a superorder that ruled the earth for 200 million years to our species which has only ruled it for 10,000 years is incredibly misleading on a couple of levels.
1) Dinos never ‘ruled’ but were simply very successful, whereas humans actually ‘rule’ by consciously controling many aspects of the planet and some of its systems (biosphere, atmosphere, hydrosphere, geosphere),
and, more relevant to the way the statement is typically used,
2) comparing a single species to a superorder that likely contained many thousands of distinct species (for a list of just the genera, look here http://en.wikipedia.org/wiki/List_of_dinosaurs) doesn’t make sense- it’s an apples to oranges kinda thing.
Sorry for being so nit-picky, but I hear that comparison all the time and it’s a meaningless one that misleads instead of informing. (I hope I’m not overstepping the bounds of a newcomer here.)