The difference is that TF.N is not a prequel webiste, or a SE website. It is supposed to be a site dedicated to all the diverse aspects of the star wars universe, which is why they have specific forums for gaming, EU, prequels, OT, and one for I-VI Saga discussions, plus many miscellaneous forums. They are supposed to be a neutral stance.
The sever slant towards non-criticism of GL and the Star Wars film i think primarly has to do with the fact that they are closely affiliated with the official Star Wars website and LFL. Lucasfilm helps sponser them, and frequently supplies them with exlusive deals and offers--in fact the current online director of the official site used to be a TFN webmaster. As well, LFL has never issued any lawsuites against TFN, despite the many spy reportrs and unauthorized used of pre-release pics and information from the PT days. As such, TFN has been towing the company line for some time now, but the most aggrevating thing of all is that they have allowed the forum enforcers who control the boards to be people who not only tow the company line but who genuinely believe in it. Personally, i find little distinction between TFN and the official star wars site, and if you visit the boards of each of them they are controlled and moderatted in pretty much the same way.