Personally, I have a few pet peeves: escort missions, protect objective for a certain amount of time (like a generator), and infinitely respawning enemies *looks at CoD 4 on Veteran*.
What about you guys?
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If the game is mostly QTEs. I only have a few exceptions. Boss battles are fine after beating them in a fight then a QTE comes on. Infinitely respawning enemies, and grenades. I'm surprised the [url=http://www.wikipedia.org/wiki/Godwin%27s_law]-godwinslaw!-[/url] during WWII didn't win with how many grenades they had. They must have had like 20 in their coats.