These reports are characteristic of HTCs poor quality in build. I have had enough experience with HTC phones to say they are not producing a quality device when compared to their competitors. My experience is based off of HTC HD7, Sensation, Amaze, Nexus One, myTouch 4G to name a few which all had issues. Every Samsung device I have had, 4 Vibrants, 2 Galaxy S II, Nexus S, Galaxy Tab all did not experience quality issues. I have owned 7 iPhones and no issues there either.
Disclosure: I buy a new phone roughly every other month. (Hobby)