Which was the project of O&K, written by some of their minions. Yet their movie was less fanwankish than their comic (and still more fanwankish than any other movie).
As comics have a narrower target audience it is not surprising that they are more fan-orientated.
You could easily claim that NEM fails because the fan who wrote it did not stick close enough to what has come before. Picard driving a buggy, vampires from the dark side of the moon overwhelming the mighty Romulan Empire, sounds quite antithetical to TNG. That's why I don't believe that scriptwriters who are fans write necessarily more fanwankishly (now that's a funky adverb).