This. I have no problem with people who do reps to failure, but I do have a problem with reps for time. As you get tired, your form gets worse and worse. This is fine for calisthenics, (hard to tear something while doing push-ups) but it's bad for heavier weight, and it's ridiculously dangerous for technical lifts like clean and snatch.

I do enjoy joking about WODs, though. "Okay - I'm gonna do AMRAP snatch on a bosu ball, and then do box jumps onto another bosu ball!"