1. The Black Bat symbol is highly overrated. Most people only like it because of Frank Miller. And the way most people choose to associate the Yellow Oval with "camp" is ridiculous considering it was featuring in some of the more serious Batman stories.
2. Speaking of overrated: Tim Drake as Robin. Don't get me wrong, I liked him in the 90's and early 00's, but then he became a mary sue. He benefits from being Robin during the modern era of comics, where storytelling became more complex and supporting characters got their own titles. On a conceptual level, Dick Grayson is still the best Robin, which is why he constantly gets adapted into movies/TV more than anyone else.
3. Speaking of overrated again: Scott Snyder Batman. His run can be enjoyable, especially Black Mirror and the 1st half of the Owls storyline, but fanboys treat him like the next coming of Frank Miller, when he hasn't done anything nearly as special or innovative.
4. I think Catwoman as Batman's "One True Love" is a generally bad idea. I've been characterized as "hating" the Bat/Cat romance, and I don't think that's true at all. Its just that the idea of them being absolute soulmates is off putting to me. Bruce/Selina works best on sexual tension and "what could've been", and both characters suffer when you try to put them in a normal romance. I think a lot shippers think that every character needs to have "The one", but the great thing about Batman is that he dosen't really have one.
5. I think TDKR is the weakest film in the Nolan Bat Trilogy, but Batman purists overhate the film way too much for the dumbest of reasons, reasons that make me wonder if they actually watched the film.
6. Never really gave a damn about Babs as Oracle, especially since she was a convenient plot device for Batman to gain info from, negating his "World's Greatest Detective" side. I don't blame DC for reverting her back to Batgirl, as that's what she's known for in the first place.
7. Alfred raising Bruce as a kid has become stale to me. I'd love to see a modern version of the Pre Crisis Batman/Alfred relationship, where Bruce is well into being Batman and this british guy shows up to be his butler.
8. Adam West is probably the most comic book accurate live action Batman. And he's definitely the only live action Batman that actually seemed like he had genius-level intellect.
9. Bat-God is king. When you're the superhero who unseated SUPERMAN as top dog, you deserve a power upgrade. I hate when Bat Fanboys talk about Bat God, but the concept itself is fine.