In short, often, yes. The biggest flamewars were fought (and fought bitterly) over oMage and Hunter. Without desiring to re-fight those battles, let me say merely that Mage's feuds centered mainly around the differences between Second Edition and Revised or Third Edition; Hunter's were between two camps who had opposing views on the central focus of the game, and specifically how it differed from a previous supplement in an earlier edition which had filled the "hunter" niche.



All of this is more or less indicative of a larger pattern: people argue, vigorously and vehemently, for or against things they like or loathe.



-B



Edit: Hm, I'd forgotten that Mage also had many arguments over how exactly a mage character's paradigm influenced the workings of magic and Paradox. Those were fun, too, especially because they had catchy acronyms to sum up their points of view.