The m8 is a popular Android flagship. How long did it take you to find a one complaint about chassis issues for a phone released 8 months ago?
The m8 is popular among Android enthusiasts. It is not popular outside of them. I would be surprised to hear they sold as many m8s since their launch as Samsung moves new models in their first month, or Apple moves new models in their first weekend. The only player in Android who enjoys any degree of mainstream popularity is Samsung(here in the states anyway).
And it took exactly one google search, the top return on my search term in fact, to find that story. You can find more examples of bent non-apple phones too, if you care to, which I'm guessing you don't.