Almost everyone I know is nerd, so this is my baseline for comparison.
A lot of nerds have excellent communication skills (although it does not necessarily make them popular) For example Eliezer always makes a very good impression. A lot of academic people are also excellent presenters and discussion partners.
One of my concrete problems with Razib was that he somehow felt the urge to immediately start to talk (even if what he said was loosely related to the question) and it looked like that he was grasping the question while he was talking. For example, Eli...
Link.
"Razib Khan has an academic background in the biological sciences, and has worked for many years in software. He is an Unz Foundation Junior Fellow. He lives in the western United States."
Razib's writings can be found on his blog, Gene Expression.