Was about to say, where did his faulty one come from if not le factory!
that's why the word "usually" was used
i've now had 4 launch sony consoles and all of them have been brilliant in terms of build quality. my ps1 still works today, as does my ps2 (although it has gotten very noisy) and both those consoles were abused in terms of use.
i don't game as much as i used to back then so the ps3 has seen less useage and it was the first console to die on me from sony albeit after 5 years and 11 months of decent use, unlike the 360 where I went through several within a couple of years and even more after that before i gave it away.
bare in mind consoles are far more advanced nowadays and have many more parts and technology inside them. the more complicated they get and the more parts there are increases the failure rate because that is more parts which could potentially fail.
e.g. if you have a car which is basically a chassis, 4 wheels and an engine, there's not much that can go wrong. take another car which is fully loaded with everything then, the cd player could fail or the tv's or the electromagnetic handbrake, or the turbo, etc, etc. basically anything out of the thousands of parts could fail which therefore increases the failure rate.
not had any issues with my launch ps4 at all, i have had some peeling on the controller however.
imo they are pretty much bulletproof, sony know how to make a good console. i'm not surprised the PS3 was the only one i've had die on me because it was so complicated and the ps4 arguably is less so, they have not got this monstrous cell CPU inside them, etc. they have got a special type of RAM though which has never been used this way before, that could be it's weak point, it could cause a lot of failures should it not be as reliable as DDR3, we shall need to wait and see.
obviously nobody can guarantee that every console leaves the factory flawless then there are bumps along the way, you could get a stupid handler in the warehouse or a stupid delivery driver or postie which gives it a knock which then causes a failure at some point.
overall from my experience of owning now 4 launch consoles they have pretty much been bulletproof. i'm not surprised the ps3 was the first to die on me, but it gave a pretty good innings before hand.
obviously MS fanboys don't want to believe that Sony has a much better track record of making reliable consoles, but from my experience of owning and using both, Sony have never had reliability issues. Some are obviously going to fail but the majority are usually bulletproof.
also launch consoles tend to be the most unreliable out of all the revisions, and i've never had any issues with any of mine, nearly 6 years of life on the ps3 was probably pretty good for a launch console of it's kind (outlasted 5-6 360's that is for sure anyway, so you can't say it was a poor showing).