The other day, I was watching a TED talk by a French speaker. He was speaking English, but with a heavy French accent. At times, I could only understand a word he'd used once I had heard the complete sentence. Now, not everyone can speak perfect English (certainly not me), but an accent like this can make it really hard to follow what you're talking about. We've had that discussion with some of our TEDxStuttgart speakers who often would like to speak in English, hoping to reach more people that way, even though their English wasn't that good.
TED is known to only upload the talks that they consider good, even skipping some from their own conferences. So why did they decide to publish this one?