"the ambitious, the obstructionist sycophants, the jealous under-achievers, the indifferent shirkers."
You missed off the those who just want to do the job, the can-do force-multiplier, the confident over-achievers, and the quiet supporters who do not seek recognition.
I certainly think there are more than just four distinct personality types. You seem to fit into the disillusioned, jaded and cynical Pfft category.