While I'm sure you could dig up a fan somewhere that is completely blind to all the mistakes, goofs, and insane leaps of logic and physics that the G1 cartoon made I don't think there are many people who love the cartoon that would call it perfect. Instead it seems to be more of a case that G1 is beloved for what it was instead of for getting everything right. When Transformers first hit the airwaves it was part of a flood of 22 minute toy tie in cartoons. All of them cheaply made and having to just make things up as they went along to sell the next line of toys. Out of all those 80's toy cartoons you just had a few line Transformers, GI Joe, Masters of the Universe, or Thundercats to endure towards revivals. Comparing G1 to it's cartoon rivals at the time and while other fan boys will argue their cartoon was the best Transformers stands out as perhaps the best series of that time period. Jump to the live action movies and I think with the budget and the army of talented film makers working on the movies some people were just expecting better results. Not perfection because you can find goofs and mistakes with any movie, but at least goofs and mistakes you'd have to look really close to catch. Unlike the G1 cartoon Transformers doesn't stand out against it's live action rivals. Sure live action Transformers is trouncing the hell out of live action GI Joe, but it doesn't look as good against something like live action Avengers or live action Batman. If live action Transformers had hit all the right notes between new fans and old fans, people looking for a good story and people looking for huge action, the fans looking for epic film heroes and the people looking for epic film villains then I don't think you'd find nearly as much fussing by fans. Just look at the Avengers it's sure not a perfect film but it hits all the right notes for such a wide array of people that it's sort of the model people point to when they say I'm looking for this in a live action film.