Never realized so many pet peeves exist for films. Though I disagree with a lot of what's being thrown around.
Mine include zooming, intro credits, and melodramatic music.
Zooms work okay in comedic moments; see Scott Pilgrim and most Tarantino films. But when a film is dead serious, or an epic, it totally draws me out. It's artificial and ugly.
As for intro credits; they serve no purpose. There's absolutely zero need to remind us it stars so and so, and is directed by such and such. This is especially true for atmospheric films. I think it's in fact counterproductive to "set up" atmosphere from the top. Let your film guide us through the motions naturally.
The music one I have to specify. There's this romantic attraction with most asian films and classical Baroque-era music. It mostly works for genre films, because it's so in your face; see Battle Royale. But as much as I love, say I Saw the Devil, the one segment that bugs me the most on repeat viewings is the one early on, upon finding the body of the fiancee. It's a potentially dramatic/dark scene but instead it's not taken seriously; the music used is bombastic and annoying