Is there a particular graphical technique you find particularly irritating, at least when used poorly?

Some common offenders:

Chromatic Aberration

Depth of Field

Motion Blur

Bloom

Lens flare/dirt

Film Grain

I love how you picked the ugliest possible example of each effect.

I'm gonna go with bloom. It's a massive resource hog and 90% of the time hideous to boot. Though The Witcher 3 did use it quite tastefully.

Oh trust me, there's worse. :P

can't stand when games have motion blur without the option to remove it, at least tekken often allows you to get rid of it, but the default of having it on just makes the game look messy imo though.

I actually like the Lens flare lol

Where's the option for none?

I love all the image effects!

Oh man, those effects are annoying as hell, especially Syndicate reboot, bloomy!

I forgot what its called but I hate that cinematic mode where they put bars at the top and bottom of the screen to make it seem like a movie. It is the stupidest effect I have seen in my life... Instead of being able to see more of the game, here, see less! Like da faq

I think each of these can add to the presentation when employed shrewdly, but many games that add them get carried away with them. Chromatic aberration, however, usually seems to hurt more than it helps and I could do without it.

On a positive note, I really like how motion blur adds to the sense of speed in each of these games:

excessive motion blur on games running at 30 fps