Not really pertinent lol? Encephalization quotient is a very highly reliable indicator of intelligence. Brain size does indeed matter, since iirc Neanderthals were in fact smaller than us.
In fact 100,000 years ago or so some humans had significantly bigger brains than we do and therefore were more intelligent. At certain points in time there were hominids who seemed to have intelligence far greater than ours.
Some palaeontologists hummed and hawed at the time of these discoveries and came up with elaborate explanations and far-fetched theories about metabolism, or world climate at the time, or other things about how it couldn't possibly be so that they were significantly more intelligent than us. However I think it's fair to say the majority accept that we are NOT the most intelligent species that has ever existed. And why would we believe we were?
http://news.softpedia.com/news/Neanderthals-were-too-smart-to-survive-15264.shtml (claims Neanderthals were smarter)
All making the mass media billvon, perhaps you were too busy with the sports section or tv guide...
I've often wondered what it would be like to be a very intelligent animal like a porpoise. Nothing but flippers and an ocean to swim around and make a living in. Or how about the octopus with a lifespan of two or three years. Can you imagine what it could do if it lived as long as we do? A very intelligent animal.
But humans have arms and hands and a very social nature which allows them to learn and record knowledge to pass on to future generations. Without our society we would still be naked animals in the bush. We don't have to be the most intelligent animals to make a better life for ourselves so we can feel superior to all other animals.