These people, like plunderfull mentioned, would dislike a sequel of a certain game and like the old one. Also, they will attempt to make the sequel of the previous game exactly like the previous game. They degrade anyone who does likes the regular version of the sequel and dislikes the revised version of the sequel which is the same to the game before the sequel.
A few threetards in the Bnet forums are:
Southpole, Kira Onime, eRage Sanctity, St3althsniper22, Sentox 6.