Some of the complaints in this thread make me wonder if Mercedes has a really good automatic braking system, or if you are all much more erratic drivers than my wife and I to make them kick in all the time on your cars (or maybe a the systems are all temperamental, and we just happen to have driving styles that align with MB's AEB). Across a couple of their cars, I've only noticed it kicking in once, and in a situation where it definitely helped avoid an accident (car ahead braked rapidly and unexpectedly in fairly light traffic at around 40mph).
They have been recent cars though, so I'm inclined to agree with the comment theorizing that maybe those cars just aren't as new
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