People need to realize the Ps4 and X1 are going to be the first major consoles released in the Twitter/Youtube/ Social media era so there is gonna be tons of stuff out there anytime a system has a defect.
Most electronics like laptops, tvs, consoles, etc have a defective rate of around 3% which is normal. Taco Bell gave out 4000 systems, plus there are probably another 100 or so out there with reviewers, so having 7-8 random people have defective systems does not mean there is a crisis.
Sony has been making hardware forever I doubt they did not test the system out beforehand.
Back when systems launched before the only way people would know is if you complained on a forum to a small audience. Now anyone can go online and make a complaint on twitter, facebook, youtube, etc and have a huge audience.
Heck even Microsoft tried to cover up the RROD the first few years of the 360 until they had a lawsuit thrown at them which made them admit to there being a problem. Just imagine if social media was huge back then, there would be no way to cover it up.
A certain percentage of launch day systems will have defects, they always do. However with social media being as big as it is now, more people will know of the issues.