Syburn .... yes, I know what you mean.
First of all ... wherever things are produced, there are errors made and the possiblity exists that some products are not as good as others. The variation may be that 60% of the output are junk (e.g. if you buy an old car made in Russia) or that 0.001 % of the output does not perform as specified.
For every 1,000 very happy users that do not make any comment, there will be one who is not happy for various reasons.
The internet gives that one guy the possibility to tell everybody about his (presumed or actual) misfortune.
It is pretty hard for you as somebody with little experience in the matter to decide which opinion is worthwhile and which opinion is just whining.
OK, it's possible if you take a bit of time and read more than one opinion.
But it's the first time I have heard about the cameras having issues. 95% of the time it's the user who is to be blamed ... but it's just so much easier to write an inflamatory post on the internet than to sit down and read the manual 
With lenses, there sometimes is the case of 99% of users having very good ones and 1% of users receiving a bad one. But those threads - if there really IS a problem - normally end with 'brought it back to the store, and they exchanged it'.
And then there are the guys who say 'I had to test 5 24-70/2.8 L lenses (presumably one of Canon's best and most expensive lenses) until finding a decent one' ... which normally make me chuckle.
I had a colleague once who got a new Mercedes Benz (basically the smallest available C-class, somewhere around 35,000$) as company car. He complained that he saw a fingerprint in the front windshield (there was one, it was nearly invisible on the side of the window) and he insisted that the windshield be exchanged (a $ 500 repair job). When he got the car back, he complained that the new windshield also had a fingerprint inside and that he wanted to have it exchanged a second time...
According to his definition 'this should not be acceptable for a new car'. Notice ... he would not even buy himself, but just ride it for 2 years and then give it back ... a bit out of proportion for me, but people have varying degrees of jerkness.
Take it easy....
Best regards,
Andy